* 2D image painting with textures that contained alpha did not work correctly,
had been broken for a while.
* 2D image panels texture (mask) panels showed wrong buttons for texture overlay.
* Texture map mode 3D now also uses masking, like Tiled and Stencil the texture
does not move along with the brush so it works fine.
* 2D image paint View mapping did not work correct, especially noticeable with
Rake rotation.
* Masking is now disabled for the smear tool, this can't really work because
the original image is constantly changing and gave artifacts.
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