[issue16113] Add SHA-3 (Keccak) support

[Christian Heimes]

Christian Heimes added the comment:

The hightlights of the next patch are

* release the GIL
* more test vectors
* remove bgr_endian.h
* move typedef UINT64 to sha3module
* declare more globals as static

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16113>
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