Blender Git Loki

Texture rake brushes for texture paint mode
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* Reading into the code, i am starting to get the hang of what is going
on :)
* I disabled the texture rake for projection paint because it didn't
work too well (will check why next). I suspect a sampling offset issue.
So I started implementing rake brushes for regular non-projective
texturing and uv/image viewwer. This commit makes this work :). I will
probably have to move the rotation part from the BKE_brush_sample_tex
function and modify the coordinates directly. This will ensure that for
projective or even fixed mode texturing this will work as expected (?)