/// ## Changelog
/// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~none
/// [date][x.yy.zz]-[description]
/// -[date]: date on which the change has been pushed
/// -[x.yy.zz]: Numerical version string representation. Each version number on the right
///             resets back to zero if version on the left is incremented.
///    - [x]: Major version with API and library breaking changes
///    - [yy]: Minor version with non-breaking API and library changes
///    - [zz]: Bug fix version with no direct changes to API
///
/// - 2019/09/20 (4.01.3) - Fixed a bug wherein combobox cannot be closed by clicking the header
///                        when NK_BUTTON_TRIGGER_ON_RELEASE is defined.
/// - 2019/09/10 (4.01.2) - Fixed the nk_cos function, which deviated significantly.
/// - 2019/09/08 (4.01.1) - Fixed a bug wherein re-baking of fonts caused a segmentation
///                        fault due to dst_font->glyph_count not being zeroed on subsequent
///                        bakes of the same set of fonts.
/// - 2019/06/23 (4.01.0) - Added nk_***_get_scroll and nk_***_set_scroll for groups, windows, and popups.
/// - 2019/06/12 (4.00.3) - Fix panel background drawing bug.
/// - 2018/10/31 (4.00.2) - Added NK_KEYSTATE_BASED_INPUT to "fix" state based backends
///                        like GLFW without breaking key repeat behavior on event based.
/// - 2018/04/01 (4.00.1) - Fixed calling `nk_convert` multiple time per single frame.
/// - 2018/04/01 (4.00.0) - BREAKING CHANGE: nk_draw_list_clear no longer tries to
///                        clear provided buffers. So make sure to either free
///                        or clear each passed buffer after calling nk_convert.
/// - 2018/02/23 (3.00.6) - Fixed slider dragging behavior.
/// - 2018/01/31 (3.00.5) - Fixed overcalculation of cursor data in font baking process.
/// - 2018/01/31 (3.00.4) - Removed name collision with stb_truetype.
/// - 2018/01/28 (3.00.3) - Fixed panel window border drawing bug.
/// - 2018/01/12 (3.00.2) - Added `nk_group_begin_titled` for separed group identifier and title.
/// - 2018/01/07 (3.00.1) - Started to change documentation style.
/// - 2018/01/05 (3.00.0) - BREAKING CHANGE: The previous color picker API was broken
///                        because of conversions between float and byte color representation.
///                        Color pickers now use floating point values to represent
///                        HSV values. To get back the old behavior I added some additional
///                        color conversion functions to cast between nk_color and
///                        nk_colorf.
/// - 2017/12/23 (2.00.7) - Fixed small warning.
/// - 2017/12/23 (2.00.7) - Fixed `nk_edit_buffer` behavior if activated to allow input.
/// - 2017/12/23 (2.00.7) - Fixed modifyable progressbar dragging visuals and input behavior.
/// - 2017/12/04 (2.00.6) - Added formated string tooltip widget.
/// - 2017/11/18 (2.00.5) - Fixed window becoming hidden with flag `NK_WINDOW_NO_INPUT`.
/// - 2017/11/15 (2.00.4) - Fixed font merging.
/// - 2017/11/07 (2.00.3) - Fixed window size and position modifier functions.
/// - 2017/09/14 (2.00.2) - Fixed `nk_edit_buffer` and `nk_edit_focus` behavior.
/// - 2017/09/14 (2.00.1) - Fixed window closing behavior.
/// - 2017/09/14 (2.00.0) - BREAKING CHANGE: Modifing window position and size funtions now
///                        require the name of the window and must happen outside the window
///                        building process (between function call nk_begin and nk_end).
/// - 2017/09/11 (1.40.9) - Fixed window background flag if background window is declared last.
/// - 2017/08/27 (1.40.8) - Fixed `nk_item_is_any_active` for hidden windows.
/// - 2017/08/27 (1.40.7) - Fixed window background flag.
/// - 2017/07/07 (1.40.6) - Fixed missing clipping rect check for hovering/clicked
///                        query for widgets.
/// - 2017/07/07 (1.40.5) - Fixed drawing bug for vertex output for lines and stroked
///                        and filled rectangles.
/// - 2017/07/07 (1.40.4) - Fixed bug in nk_convert trying to add windows that are in
///                        process of being destroyed.
/// - 2017/07/07 (1.40.3) - Fixed table internal bug caused by storing table size in
///                        window instead of directly in table.
/// - 2017/06/30 (1.40.2) - Removed unneeded semicolon in C++ NK_ALIGNOF macro.
/// - 2017/06/30 (1.40.1) - Fixed drawing lines smaller or equal zero.
/// - 2017/06/08 (1.40.0) - Removed the breaking part of last commit. Auto layout now only
///                        comes in effect if you pass in zero was row height argument.
/// - 2017/06/08 (1.40.0) - BREAKING CHANGE: while not directly API breaking it will change
///                        how layouting works. From now there will be an internal minimum
///                        row height derived from font height. If you need a row smaller than
///                        that you can directly set it by `nk_layout_set_min_row_height` and
///                        reset the value back by calling `nk_layout_reset_min_row_height.
/// - 2017/06/08 (1.39.1) - Fixed property text edit handling bug caused by past `nk_widget` fix.
/// - 2017/06/08 (1.39.0) - Added function to retrieve window space without calling a `nk_layout_xxx` function.
/// - 2017/06/06 (1.38.5) - Fixed `nk_convert` return flag for command buffer.
/// - 2017/05/23 (1.38.4) - Fixed activation behavior for widgets partially clipped.
/// - 2017/05/10 (1.38.3) - Fixed wrong min window size mouse scaling over boundries.
/// - 2017/05/09 (1.38.2) - Fixed vertical scrollbar drawing with not enough space.
/// - 2017/05/09 (1.38.1) - Fixed scaler dragging behavior if window size hits minimum size.
/// - 2017/05/06 (1.38.0) - Added platform double-click support.
/// - 2017/04/20 (1.37.1) - Fixed key repeat found inside glfw demo backends.
/// - 2017/04/20 (1.37.0) - Extended properties with selection and clipboard support.
/// - 2017/04/20 (1.36.2) - Fixed #405 overlapping rows with zero padding and spacing.
/// - 2017/04/09 (1.36.1) - Fixed #403 with another widget float error.
/// - 2017/04/09 (1.36.0) - Added window `NK_WINDOW_NO_INPUT` and `NK_WINDOW_NOT_INTERACTIVE` flags.
/// - 2017/04/09 (1.35.3) - Fixed buffer heap corruption.
/// - 2017/03/25 (1.35.2) - Fixed popup overlapping for `NK_WINDOW_BACKGROUND` windows.
/// - 2017/03/25 (1.35.1) - Fixed windows closing behavior.
/// - 2017/03/18 (1.35.0) - Added horizontal scroll requested in #377.
/// - 2017/03/18 (1.34.3) - Fixed long window header titles.
/// - 2017/03/04 (1.34.2) - Fixed text edit filtering.
/// - 2017/03/04 (1.34.1) - Fixed group closable flag.
/// - 2017/02/25 (1.34.0) - Added custom draw command for better language binding support.
/// - 2017/01/24 (1.33.0) - Added programatic way of remove edit focus.
/// - 2017/01/24 (1.32.3) - Fixed wrong define for basic type definitions for windows.
/// - 2017/01/21 (1.32.2) - Fixed input capture from hidden or closed windows.
/// - 2017/01/21 (1.32.1) - Fixed slider behavior and drawing.
/// - 2017/01/13 (1.32.0) - Added flag to put scaler into the bottom left corner.
/// - 2017/01/13 (1.31.0) - Added additional row layouting method to combine both
///                        dynamic and static widgets.
/// - 2016/12/31 (1.30.0) - Extended scrollbar offset from 16-bit to 32-bit.
/// - 2016/12/31 (1.29.2) - Fixed closing window bug of minimized windows.
/// - 2016/12/03 (1.29.1) - Fixed wrapped text with no seperator and C89 error.
/// - 2016/12/03 (1.29.0) - Changed text wrapping to process words not characters.
/// - 2016/11/22 (1.28.6) - Fixed window minimized closing bug.
/// - 2016/11/19 (1.28.5) - Fixed abstract combo box closing behavior.
/// - 2016/11/19 (1.28.4) - Fixed tooltip flickering.
/// - 2016/11/19 (1.28.3) - Fixed memory leak caused by popup repeated closing.
/// - 2016/11/18 (1.28.2) - Fixed memory leak caused by popup panel allocation.
/// - 2016/11/10 (1.28.1) - Fixed some warnings and C++ error.
/// - 2016/11/10 (1.28.0) - Added additional `nk_button` versions which allows to directly
///                        pass in a style struct to change buttons visual.
/// - 2016/11/10 (1.27.0) - Added additional `nk_tree` versions to support external state
///                        storage. Just like last the `nk_group` commit the main
///                        advantage is that you optionally can minimize nuklears runtime
///                        memory consumption or handle hash collisions.
/// - 2016/11/09 (1.26.0) - Added additional `nk_group` version to support external scrollbar
///                        offset storage. Main advantage is that you can externalize
///                        the memory management for the offset. It could also be helpful
///                        if you have a hash collision in `nk_group_begin` but really
///                        want the name. In addition I added `nk_list_view` which allows
///                        to draw big lists inside a group without actually having to
///                        commit the whole list to nuklear (issue #269).
/// - 2016/10/30 (1.25.1) - Fixed clipping rectangle bug inside `nk_draw_list`.
/// - 2016/10/29 (1.25.0) - Pulled `nk_panel` memory management into nuklear and out of
///                        the hands of the user. From now on users don't have to care
///                        about panels unless they care about some information. If you
///                        still need the panel just call `nk_window_get_panel`.
/// - 2016/10/21 (1.24.0) - Changed widget border drawing to stroked rectangle from filled
///                        rectangle for less overdraw and widget background transparency.
/// - 2016/10/18 (1.23.0) - Added `nk_edit_focus` for manually edit widget focus control.
/// - 2016/09/29 (1.22.7) - Fixed deduction of basic type in non `<stdint.h>` compilation.
/// - 2016/09/29 (1.22.6) - Fixed edit widget UTF-8 text cursor drawing bug.
/// - 2016/09/28 (1.22.5) - Fixed edit widget UTF-8 text appending/inserting/removing.
/// - 2016/09/28 (1.22.4) - Fixed drawing bug inside edit widgets which offset all text
///                        text in every edit widget if one of them is scrolled.
/// - 2016/09/28 (1.22.3) - Fixed small bug in edit widgets if not active. The wrong
///                        text length is passed. It should have been in bytes but
///                        was passed as glyphes.
/// - 2016/09/20 (1.22.2) - Fixed color button size calculation.
/// - 2016/09/20 (1.22.1) - Fixed some `nk_vsnprintf` behavior bugs and removed `<stdio.h>`
///                        again from `NK_INCLUDE_STANDARD_VARARGS`.
/// - 2016/09/18 (1.22.0) - C89 does not support vsnprintf only C99 and newer as well
///                        as C++11 and newer. In addition to use vsnprintf you have
///                        to include <stdio.h>. So just defining `NK_INCLUDE_STD_VAR_ARGS`
///                        is not enough. That behavior is now fixed. By default if
///                        both varargs as well as stdio is selected I try to use
///                        vsnprintf if not possible I will revert to vsprintf. If
///                        varargs but not stdio was defined I will use my own function.
/// - 2016/09/15 (1.21.2) - Fixed panel `close` behavior for deeper panel levels.
/// - 2016/09/15 (1.21.1) - Fixed C++ errors and wrong argument to `nk_panel_get_xxxx`.
/// - 2016/09/13 (1.21.0) - !BREAKING! Fixed nonblocking popup behavior in menu, combo,
///                        and contextual which prevented closing in y-direction if
///                        popup did not reach max height.
///                        In addition the height parameter was changed into vec2
///                        for width and height to have more control over the popup size.
/// - 2016/09/13 (1.20.3) - Cleaned up and extended type selection.
/// - 2016/09/13 (1.20.2) - Fixed slider behavior hopefully for the last time. This time
///                        all calculation are correct so no more hackery.
/// - 2016/09/13 (1.20.1) - Internal change to divide window/panel flags into panel flags and types.
///                        Suprisinly spend years in C and still happened to confuse types
///                        with flags. Probably something to take note.
/// - 2016/09/08 (1.20.0) - Added additional helper function to make it easier to just
///                        take the produced buffers from `nk_convert` and unplug the
///                        iteration process from `nk_context`. So now you can
///                        just use the vertex,element and command buffer + two pointer
///                        inside the command buffer retrieved by calls `nk__draw_begin`
///                        and `nk__draw_end` and macro `nk_draw_foreach_bounded`.
/// - 2016/09/08 (1.19.0) - Added additional asserts to make sure every `nk_xxx_begin` call
///                        for windows, popups, combobox, menu and contextual is guarded by
///                        `if` condition and does not produce false drawing output.
/// - 2016/09/08 (1.18.0) - Changed confusing name for `NK_SYMBOL_RECT_FILLED`, `NK_SYMBOL_RECT`
///                        to hopefully easier to understand `NK_SYMBOL_RECT_FILLED` and
///                        `NK_SYMBOL_RECT_OUTLINE`.
/// - 2016/09/08 (1.17.0) - Changed confusing name for `NK_SYMBOL_CIRLCE_FILLED`, `NK_SYMBOL_CIRCLE`
///                        to hopefully easier to understand `NK_SYMBOL_CIRCLE_FILLED` and
///                        `NK_SYMBOL_CIRCLE_OUTLINE`.
/// - 2016/09/08 (1.16.0) - Added additional checks to select correct types if `NK_INCLUDE_FIXED_TYPES`
///                        is not defined by supporting the biggest compiler GCC, clang and MSVC.
/// - 2016/09/07 (1.15.3) - Fixed `NK_INCLUDE_COMMAND_USERDATA` define to not cause an error.
/// - 2016/09/04 (1.15.2) - Fixed wrong combobox height calculation.
/// - 2016/09/03 (1.15.1) - Fixed gaps inside combo boxes in OpenGL.
/// - 2016/09/02 (1.15.0) - Changed nuklear to not have any default vertex layout and
///                        instead made it user provided. The range of types to convert
///                        to is quite limited at the moment, but I would be more than
///                        happy to accept PRs to add additional.
/// - 2016/08/30 (1.14.2) - Removed unused variables.
/// - 2016/08/30 (1.14.1) - Fixed C++ build errors.
/// - 2016/08/30 (1.14.0) - Removed mouse dragging from SDL demo since it does not work correctly.
/// - 2016/08/30 (1.13.4) - Tweaked some default styling variables.
/// - 2016/08/30 (1.13.3) - Hopefully fixed drawing bug in slider, in general I would
///                        refrain from using slider with a big number of steps.
/// - 2016/08/30 (1.13.2) - Fixed close and minimize button which would fire even if the
///                        window was in Read Only Mode.
/// - 2016/08/30 (1.13.1) - Fixed popup panel padding handling which was previously just
///                        a hack for combo box and menu.
/// - 2016/08/30 (1.13.0) - Removed `NK_WINDOW_DYNAMIC` flag from public API since
///                        it is bugged and causes issues in window selection.
/// - 2016/08/30 (1.12.0) - Removed scaler size. The size of the scaler is now
///                        determined by the scrollbar size.
/// - 2016/08/30 (1.11.2) - Fixed some drawing bugs caused by changes from 1.11.0.
/// - 2016/08/30 (1.11.1) - Fixed overlapping minimized window selection.
/// - 2016/08/30 (1.11.0) - Removed some internal complexity and overly complex code
///                        handling panel padding and panel border.
/// - 2016/08/29 (1.10.0) - Added additional height parameter to `nk_combobox_xxx`.
/// - 2016/08/29 (1.10.0) - Fixed drawing bug in dynamic popups.
/// - 2016/08/29 (1.10.0) - Added experimental mouse scrolling to popups, menus and comboboxes.
/// - 2016/08/26 (1.10.0) - Added window name string prepresentation to account for
///                        hash collisions. Currently limited to `NK_WINDOW_MAX_NAME`
///                        which in term can be redefined if not big enough.
/// - 2016/08/26 (1.10.0) - Added stacks for temporary style/UI changes in code.
/// - 2016/08/25 (1.10.0) - Changed `nk_input_is_key_pressed` and 'nk_input_is_key_released'
///                        to account for key press and release happening in one frame.
/// - 2016/08/25 (1.10.0) - Added additional nk_edit flag to directly jump to the end on activate.
/// - 2016/08/17 (1.09.6) - Removed invalid check for value zero in `nk_propertyx`.
/// - 2016/08/16 (1.09.5) - Fixed ROM mode for deeper levels of popup windows parents.
/// - 2016/08/15 (1.09.4) - Editbox are now still active if enter was pressed with flag
///                        `NK_EDIT_SIG_ENTER`. Main reasoning is to be able to keep
///                        typing after commiting.
/// - 2016/08/15 (1.09.4) - Removed redundant code.
/// - 2016/08/15 (1.09.4) - Fixed negative numbers in `nk_strtoi` and remove unused variable.
/// - 2016/08/15 (1.09.3) - Fixed `NK_WINDOW_BACKGROUND` flag behavior to select a background
///                        window only as selected by hovering and not by clicking.
/// - 2016/08/14 (1.09.2) - Fixed a bug in font atlas which caused wrong loading
///                        of glyphes for font with multiple ranges.
/// - 2016/08/12 (1.09.1) - Added additional function to check if window is currently
///                        hidden and therefore not visible.
/// - 2016/08/12 (1.09.1) - nk_window_is_closed now queries the correct flag `NK_WINDOW_CLOSED`
///                        instead of the old flag `NK_WINDOW_HIDDEN`.
/// - 2016/08/09 (1.09.0) - Added additional double version to nk_property and changed
///                        the underlying implementation to not cast to float and instead
///                        work directly on the given values.
/// - 2016/08/09 (1.08.0) - Added additional define to overwrite library internal
///                        floating pointer number to string conversion for additional
///                        precision.
/// - 2016/08/09 (1.08.0) - Added additional define to overwrite library internal
///                        string to floating point number conversion for additional
///                        precision.
/// - 2016/08/08 (1.07.2) - Fixed compiling error without define `NK_INCLUDE_FIXED_TYPE`.
/// - 2016/08/08 (1.07.1) - Fixed possible floating point error inside `nk_widget` leading
///                        to wrong wiget width calculation which results in widgets falsly
///                        becomming tagged as not inside window and cannot be accessed.
/// - 2016/08/08 (1.07.0) - Nuklear now differentiates between hiding a window (NK_WINDOW_HIDDEN) and
///                        closing a window (NK_WINDOW_CLOSED). A window can be hidden/shown
///                        by using `nk_window_show` and closed by either clicking the close
///                        icon in a window or by calling `nk_window_close`. Only closed
///                        windows get removed at the end of the frame while hidden windows
///                        remain.
/// - 2016/08/08 (1.06.0) - Added `nk_edit_string_zero_terminated` as a second option to
///                        `nk_edit_string` which takes, edits and outputs a '\0' terminated string.
/// - 2016/08/08 (1.05.4) - Fixed scrollbar auto hiding behavior.
/// - 2016/08/08 (1.05.3) - Fixed wrong panel padding selection in `nk_layout_widget_space`.
/// - 2016/08/07 (1.05.2) - Fixed old bug in dynamic immediate mode layout API, calculating
///                        wrong item spacing and panel width.
/// - 2016/08/07 (1.05.1) - Hopefully finally fixed combobox popup drawing bug.
/// - 2016/08/07 (1.05.0) - Split varargs away from `NK_INCLUDE_STANDARD_IO` into own
///                        define `NK_INCLUDE_STANDARD_VARARGS` to allow more fine
///                        grained controlled over library includes.
/// - 2016/08/06 (1.04.5) - Changed memset calls to `NK_MEMSET`.
/// - 2016/08/04 (1.04.4) - Fixed fast window scaling behavior.
/// - 2016/08/04 (1.04.3) - Fixed window scaling, movement bug which appears if you
///                        move/scale a window and another window is behind it.
///                        If you are fast enough then the window behind gets activated
///                        and the operation is blocked. I now require activating
///                        by hovering only if mouse is not pressed.
/// - 2016/08/04 (1.04.2) - Fixed changing fonts.
/// - 2016/08/03 (1.04.1) - Fixed `NK_WINDOW_BACKGROUND` behavior.
/// - 2016/08/03 (1.04.0) - Added color parameter to `nk_draw_image`.
/// - 2016/08/03 (1.04.0) - Added additional window padding style attributes for
///                        sub windows (combo, menu, ...).
/// - 2016/08/03 (1.04.0) - Added functions to show/hide software cursor.
/// - 2016/08/03 (1.04.0) - Added `NK_WINDOW_BACKGROUND` flag to force a window
///                        to be always in the background of the screen.
/// - 2016/08/03 (1.03.2) - Removed invalid assert macro for NK_RGB color picker.
/// - 2016/08/01 (1.03.1) - Added helper macros into header include guard.
/// - 2016/07/29 (1.03.0) - Moved the window/table pool into the header part to
///                        simplify memory management by removing the need to
///                        allocate the pool.
/// - 2016/07/29 (1.02.0) - Added auto scrollbar hiding window flag which if enabled
///                        will hide the window scrollbar after NK_SCROLLBAR_HIDING_TIMEOUT
///                        seconds without window interaction. To make it work
///                        you have to also set a delta time inside the `nk_context`.
/// - 2016/07/25 (1.01.1) - Fixed small panel and panel border drawing bugs.
/// - 2016/07/15 (1.01.0) - Added software cursor to `nk_style` and `nk_context`.
/// - 2016/07/15 (1.01.0) - Added const correctness to `nk_buffer_push' data argument.
/// - 2016/07/15 (1.01.0) - Removed internal font baking API and simplified
///                        font atlas memory management by converting pointer
///                        arrays for fonts and font configurations to lists.
/// - 2016/07/15 (1.00.0) - Changed button API to use context dependend button
///                        behavior instead of passing it for every function call.
/// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
