#40 Assign colors to hotkeys

[Willie Sippel]

Setting up a list of three or four preferred colors
accessible by hotkeys, like a = Color1, b = Color2, c =
Color3, d = Color4.
This could speed up a lot of retouche work if you use a
small palette of colors.

[Willie Sippel]

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Should have been a = Color1, s = Color2, d = Color3, f =
Color4...