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Texture tool improvements.

http://wiki.blender.org/index.php/User:Psy-Fi/Texture_Paint

Done so far:

* uv preserve tool: Works with proportional editing, now with preliminary seam support

* Rake brushes on texture paint and uv editor (select rake from angle menu and deselect projective texturing). Random, and user angle working (change with Ctrl-F)

* Random size brushes

* Unified Cursor display, allows for overlay display (In progress)

* Separate mask textures for texture painting. Allows to mask current brush with an extra brush, allowing even more control on bruush strength.

* Adjust brush size with zoom