Request for review: Convert Fontwork to TextWarp on export

Hi all,

Please have a look at https://gerrit.libreoffice.org/#/c/74057/
tdf#51195, tdf#100348 Convert Fontwork to TextWarp on export

"Fontwork" of LibreOffice and "TextWarp" of MS Office have fundamental 
differences although they look similar. I have collected some at 
https://wiki.documentfoundation.org/Development/Remarks_on_Fontwork_and_TextWarp

Szymon Kłos implemented the import from PowerPoint last year. He has 
mapped the "TextWarp"-objects to our implementation of "Fontwork", which 
we use for binary import/export and ODF.

My patch would implement the export from "Fontwork" to "TextWarp" 
without character fill and outline. My question is, whether you agree, 
that such step is useful? Even if character fill and outline will not be 
implemented soon?

What is missing in this area:
* Conversion between fill/stroke of Fontwork shapes and fill/outline of 
characters in TextWarp shapes (That is likely what users want.)
* Import of TextWarp from docx
* Stretch of text block instead (or in addition) to stretch per 
paragraph, or at least switch to ScaleX=false
* Radial adjustment for curved types
* Style for single text portions
* Treating of legacy Fontwork shapes in import/export with DrawingML

Kind regards
Regina