Bitarray

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* use reconstructor function for pickling, see 207
* simplify implementation of `.reverse()`

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* allow [integer sequence indexing](indexing.rst) by list of indices,
see 204 (addresses 156 and 190)
* add [masked indexing](indexing.rst) by bitarray masks,
see 205 (addresses 190)
* improve `.bytereverse()` docstring, see issue 202

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* remove caching hash value, fixes issue 201

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* fix for pypy3.9-v7.3.11, 198 (fixes 188)
* enable building wheels for PyPy

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* register `bitarray` as `abc.MutableSequence`, see 196
* cibuildwheel: update macOS version to 11 from unsupported 10.15, see
https://github.com/actions/runner-images/issues/5583
* improve documentation regarding type when indexing single
bitarray items, 192

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* fix popcount64 name conflict on NetBSD, 189
* even though PyPy is not actively supported, allow running tests for
PyPy 3.7 and 3.8, see also 188
* allow running `python setup.py test`
* add official Python 3.12 support
* simplify count functionality in util module
* retire `bitcount_lookup[256]` table
* improve `util.count_n()` error messages
* avoid `util` module tests from being run more than once in each
call to `bitarray.test()` when called multiple times in the same
Python process, see 6e52e49a
* improve testing