Changes

27.7.21

Ensure that relative output directories work correctly.

25.7.21

Add use of

````
--ExportMarkup Value for wdExportItem - default wdExportDocumentContent.
          use wdExportDocumentWithMarkup to export all word comments with pdf
````

-----------

Allow exporting of comments to a pdf.

Add Powerpoint as a converter in PR #92

7.12.19

Docto and XLS combined together.
Resource String Class
