Dark mode

[GingerAvalanche]

Dark mode is junk.

To a certain extent, I may not be able to fix this. There are certain elements that the framework hardcodes to use the system defaults, so I would have to replace those with pure Python alternatives, which I may or may not ever get around to doing.

[GingerAvalanche]

Dark mode still leaves the radiobox (Actor Property box) labels black. Might have to implement my own, to get around that. Dark mode should handle almost everything else fairly well. Menu bar needs fixing as well, may also have to implement my own one of those.