[issue16113] Add SHA-3 and SHAKE (Keccak) support

[Christian Heimes]

Christian Heimes added the comment:

The maintenance burden is minimal. All six algorithms are just variants of the same KeccakP-1600 sponge construction with different initialization parameters for rate, capacity, delimiter and output size. SHAKEs have no default output len and another delimiter as SHA3s. https://github.com/gvanas/KeccakCodePackage/blob/master/Modes/KeccakHash.h#L34

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<http://bugs.python.org/issue16113>
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