darkenRgb should be moved to colors #2
Description
There is already a hueToRgb and hsbToRgb function in the color logic and darkenRgb should be promoted there and the core paint.py retested.
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There is already a hueToRgb and hsbToRgb function in the color logic and darkenRgb should be promoted there and the core paint.py retested.