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The theme resource was done from scratch to avoid the use of unnecessary/outdated theme properties (a clean theme resource should make it easier to adjust and vary in the future). However that means some controls are not styled yet, because I didn't see them used anywhere. Additional work might be especially necessary on the various subwindows (which use stuff like tabs, etc.), but these didn't seem to respect my theme changes anyways, so I decided not to care for now.
Things don't really look perfectly like I envision them, because there are some panels and other customization options missing. But I think this is a good start for a new theme. I've not made it the new default, just added it to the theme list.
The theme uses the Rubik font, as suggested by Tarox.