Our hsv logic assumes 0-1 (cs.rit.edu says "r,g,b values are from 0 to
1") and it makes more sense to provide __mul for multiplying in 0-1
since the result will stay in that range. Additionally, love switched to
0-1 color since 11.0.
Included an as_255() function to unpack the color in 0-255 for some
amount of backwards compatibility. Doesn't make sense to provide any
kind of color object for it since most of our functions won't work
correctly.
Add tests for hue(), saturation(), value() that fail (even with /255
removed) for the old code, but pass on the new 0-1 range because the hsv
logic outputs colors in 0-1. Test comparisons use reduced precision
because my input data has limited precision.
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