Fixed the node frames to be a bit more visible.
A few tiny tweaks. Maybe the last ones?
Some readabilities issues here and there have been fixed, like in mesh edit mode, curves in the node editors and general stuff in the animation editors. Also some other small stuff has been slightly tweaked.
A few miiinor tweaks.
First and hopefully final version. Theming in Blender really is an awful maze that I prefer not to do again :F