Mapbuffer

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* install: add "str" to make numpy import go smoothly
* build: add support for py312

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* build: skip musllinux
* fix: memory leak in eytzinger\_binary\_search

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* build: update cibuildwheel
* build: add py311 to appveyor
* fix: compile warnings
* perf: faster, more efficient eytzinger sort for mapbuffer
* chore: whitespace
* install: add numpy requirement
* perf: much faster dict2buf
* feat: fast eytzinger sort index creation
* perf: improve memory usage in dict2buf
* build: update tox

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* build: update appveyor and GHA. exclude py36
* feat: IntMap simplified structure for u64 -> u64 (11)

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* release(0.5.1): validate uses caching
* perf: allow validate to take advantage of caching
* chore: update ChangeLog

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* Format Version 1: Adds crc32c checks. (8)
* refactor: make mb perf easier tot est
* fix: PROT\_READ is a UNIX parameter (7)
* fix: allow multiple processes to try working with the file
* docs: show how to use mmap