Documentation needed for font and color support

[TheRadialActive]

We revamped the sphinx documentation, but what's missing is the section about fonts and colors support: https://sdaps.org/LaTeX/#fonts

[benzea]

The thing here is that not all of these features have been implemented yet (please shout if you need them so that it will be prioritised):

Currently implemented are:

• sectionbgcolor
• sectionfgcolor
• singlemarkchoicefont
• choiceitemfont
• questionfont

Note that these should not be documented. The new class has a different mechanism to set configuration options and these options may need to be migrated, breaking the old method.

The old class had the following options:

• barcodefont
• questionnaireidfont
• surveyidfont
• choicefont
• singlemarkchoicefont
• marklinequestionfont
• marklinechoicefont
• choiceitemfont
• choicegrouplinefont
• choicegroupchoicefont

and for colors:

• sectionbgcolor
• sectionfgcolor
• (groupevenrowcolor, was removed again)
• (groupoddrowcolor, was removed again)