Blender Git Loki

Fix for messy commits in attempt to fix groups wire colors...

- if you add new theme colors, you need to initialize them correctly and
add that in the usiblender.c version patching for saved themes
- the code for detecting group membership was highly confusing
- group colors were even used for non-groups

Further; I didnt add group theme colors yet, that's not a bug. It's a todo
item I preferred to tackle with having a decent wirecolor system once.