Blender Git Loki

* bug fix: overlay wasn't showing unless cursor hit model because the viewport wasn't initialized properly.

* overlay now works in FIXED mapping mode
* overlay now just loads alpha and purely uses transparency to show strength (this eliminate dark borders on the overlay)
* overlay now shows when cursor is in viewport, not just when it is over the model (full time display operator is coming soon)
* when in fixed mapping mode, the curve fall off is included in the overlay (I'll give option to do that with tiled mode later, but requires multitexture)
* rake and pressure resizing are taken into account
* in fixed mode an attempt is made to only allocate as big a texture as needed for the brush size, and it doesn't resample if the brush shrinks
* rotation and offset are baked into the texture because emulating everything blender can do with textures in opengl would require a lot of code (same will eventually be done with texcache, which will make it even faster)

* The 30k commit was a bit buggy...
Operator precedence ftw!

* overlay generation now uses OpenMP

* overlay is calculated as a set of GLubytes instead of floats so it takes up less memory while being calculated (also moving towards maybe unifying the texcache and overlay)

== Radial Symmetry ==
Now there is mirror symmetry and radial symmetry that can be mixed and matched at the same time (never trust me when I say something is difficult :)

== Radial Symmetry ==
Symmetry has two modes now, planar and radial. They are mutually exclusive currently but could probably be mixed and matched later (thats too complicated for a simple feature atm).

I have not added a new feature for a bit so I thought I'd throw this in since it was requested just to let our feedback team know I'm alive :)

* brush time property is used in uv painting

* removed more unlimited clay

* removed more pieces of unlimited_clay

* removed unlimited clay

merge of commit by elubie now mingw compiles again

== Merged with trunk @ 30051 and Fixed merge mistakes from long ago (hopefully) ==

more merge fixes

more merge fixes

more merge fixes

more merge fixes

more merge fixes