Optional dependencies used for viewing corresponding file types:
 * [ImageMagick](https://imagemagick.org/)
 * [ffmpegthumbnailer](https://github.com/dirkvdb/ffmpegthumbnailer)
 * [fontpreview](https://github.com/sdushantha/fontpreview)
 * `pdftoppm`
 * [ddjvu](http://djvu.sourceforge.net/doc/man/ddjvu.html)
 * [gnome-epub-thumbnailer](https://gitlab.gnome.org/GNOME/gnome-epub-thumbnailer)
 * [fuse-zip](https://bitbucket.org/agalanin/fuse-zip)
 * [rar2fs](https://github.com/hasse69/rar2fs)
 * [fuse3-p7zip](https://github.com/andrew-grechkin/fuse3-p7zip)
 * [archivemount](https://github.com/cybernoid/archivemount)

Credits:
 * Many of the thumbnailer commands are copy pasted from
   [vifmimg](https://github.com/thimc/vifmimg).

Authors:
 * xaizek
 * Mahor Foruzesh (mahor1221)
