Feature Request: Edit syntax color schemes in GUI (or a whole set of color schemes for dark background)

[ViktorNova]

It would be cool to edit the syntax highlighting color schemes for each language from within the app. Even if this just meant opening the xml files in the editor and using the color picker (although I couldn't find all of those, like lua for example.)

Biggest reason for this request is that many syntax highlights are unreadable against a black/dark background, as mentioned at the old forum:
http://sourceforge.net/p/juffed/feature-requests/33/