* Added a new Paint type in scene DNA. This is now the base struct for Sculpt.
* The Paint type contains a list of Brushes, you can add or remove these much like material and texture slots.
* Modified the UI for the new Paint type, now shows the list of brushes active for this mode
* Added a New Brush operator, shows in the UI as a list of brush tool types to add
* Made the sculpt tool property UI smaller and not expanded, expectation is that we will have a number of preset brushes that will cover the basic sculpt brush types
TODO:
* Vertex paint, weight paint, texture paint need to be converted to this system next
* Add brush presets to the default blend
* Made texture paint object-localized too.
Note for Brecht: gpu_draw.c had three uses of G_TEXTUREPAINT that I was not able to cleanly fix, so commented out for now. Can you take a look and see what should be done here?
* Weightpaint is now object-local like sculpt and vertexpaint.
* Fixed a bug spotted by DingTo, going from editmode to sculptmode didn't fully leave editmode
* Replaced FACESEL_PAINT_TEST macro with paint_facesel_test. This removes one more thing from BKE_global, and it'll make it easier to localize.
* Fixed sculpt paint cursor sometimes not showing.
