Blender Git Loki

UI changes for color picker

* Colors have labels, so previews don't need to be as big, GP_BOX_SIZE set to 32.
* More padding between items, they are too close to each other at the moment GP_BOX_GAP set to 24.
* Round boxes are a bit less round to match the rest of the UI 0.2f (before used 0.4f)
* Cursor should not change to color picker. We are performing an action (selecting an item), not picking UI colors per se.

Thanks Pablo Vazquez for the feedback