Recursively input Markdown text

[#74084592]
Add accidentally un-added tests for coloredtexthtml

[#74084592]
Add input support to PolyTeX-to-HTML

[#74084592]
Support file input in PolyTeX PDFs

[Delivers #74084592]
[#74084592]

* 74084592-included-code:
  Support file input in PolyTeX PDFs
  Add input support to PolyTeX-to-HTML
  Add accidentally un-added tests for coloredtexthtml
  Recursively input Markdown text
Bump version number
Merge branch 'master' into stable