2nd try of fixing color fluctuations in colorsmudge-dulling brushes
Now the colorsmudge brush does all the blending in the high bit-depth
colorspace. The patch introduces a special wrapper
(KisPrecisePaintDeviceWrapper) that ensures a proper color space is used
when needed. See the apidox in KisPrecisePaintDeviceWrapper.h.
Needs to be tested:
- Colorsmudge brushes in Dulling mode with Color Rate option enabled
- Smudge Radius enabled or disabled: both should work correctly
- Opacity option should work correctly
- Overlay mode?