Blender Git Loki

Texpaint tools
===============
* Highly experimental but useful feature. Random brush size during
stroke. This can be quite useful for texture authoring but it may cause
strange things to happen if not configured right. State and memory
allocations (which makes the tool experimental) often depend on brush
size so I made a function to get the non-randomized size too. I will
most likely change the naming so that BKE_brush_size returns the non-
Still no crashes here and a few very cool things can be done with this
brush setting :)