Implement support for font options

Implement support for font options

This revives a patch by Uwe and extends it. Additional options to font
packages/fontspec can now be entered in Document Settings.
This is principally also true for TeX fonts, if the new TeXFont tag
MoreOptions is set. For the time being, I have only done this for
MinionPro, as a model and prove of concept.

Note that adding more TeXFonts requires a file format change,
respectively, and changes to tex2lyx (in the same way as I've done for
MinionPro).

This addresses #8226