Add support for caching local fonts installed on your PC to use for textboxes/nameboxes

[t3rav0lt]

Self explanatory.

[edave64]

This might be possible in the desktop version. But in the browser, we don't have permission to get a list of the installed fonts (Because that would make it easier to fingerprint and track users).
You should, however still be able to use them. Wrap the text you want to format in {font=Name of the font} and {/font}. You can, e.g., already use {font=Calibri} on any Windows system.