Color Mask & Tone Compression Improvements

## Current Behaviour Currently, the color mask only seems to affect the color transforms from the first panel (Spectrum). Additionally, Tone Compression and Color Mask cancel each other out. In other words, when I set tone compression, and then isolate with a mask, the tone compression is masked out as well. ## Expected Behaviour It would be more useful if we could isolate all color transforms (Spectrum, Density, Luminance) with the color range mask. Tone Compression and Color Mask should be mutually exclusive. Practically, this would enable us to remove the global color grade from skin tones, while compressing only skin colors.