[Bf-committers] texture painting blend mode patch

[Fredrik hansson]

i think i did submit this forever ago but it kinda got ignored or something... anyway cleaned it up for revision 51772 and submitted it again.

this patch adds a bunch of more blend modes for the texture painting brushes.

all of these are added:
Overlay 
Hard light 
Color burn 
Linear burn 
Color dodge 
Screen 
Soft light 
Pin light 
Vivid light 
Linear light 
Difference 
Exclusion 
Hue 
Saturation 
Luminosity 
Color

http://projects.blender.org/tracker/index.php?func=detail&aid=33021&group_id=9&atid=127