First draft of Okhsv color space #131
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This is a mostly mechanical translation from the reference implementation provided by Björn Ottosson.
I've not done a deep dive into the math. This just differs by a few optimizations.
Note: the conversion into and out of this color space are approximations due to
compute_max_srgb_saturation. The other picker,Okhsl, would share most of this code.