SHA3: clean up round functions #141
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This removes hard-coded round constants at a significant performance penalty.
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Addresses part of #138.
This brings the round functions into closer alignment with the spec. I found that the implementation was significantly (> 8x) slower than before, so I added hardcoded versions (and equivalence properties!) for two of the functions that involved constants. This addressed most of the slowdown.
I don't think there's anything crazy happening here; I'm just looking for general gold-standard review.