Some more work on UI drawing code, added a generic structure
for how widgets will be defined. It's still a wrapper on top
of old buttons. Docs follow still.
Some visual improvements;
- more button types supported (check render buttons)
- pressed state is shown
- better 'panel' triangle AA, and new divider style
Still a lot of work here. I expect the next days/weeks to
be much more coding too, had to catch up with a lot of other
Blender stuff. There's more (excitement) going on than code. :)
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