Pyahocorasick

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- Drop support for Python 3.6 and 3.7. Use older version for pre-built wheels.
Note that it may work on these older veriosn, we are just no longer supporting
and testing these Python versions

- Add support for Python 3.12

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- Drop support for Python 2
- Drop support for 32 bits OSes
- Re-organize code such that sources are under src/, utilities under etc/
and tests are under tests/
- Use pytest for testing and streamline tests to use a more conventional Python approach
- Build more compatible Linux wheels using "ci-build-wheel"

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- Minor rebuild to ensure Windows wheel documentation is correct ReST.

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- Use cibuildwheel to tests and build wheels on many OSes (with GitHub actions)
- Update supported Python versions. We cannot support what we cannot test:
- Drop official support for Python 2.7.
Older version still run on Python 2.7+
- Ensure that we compile with Python 3.10 and plan for 3.11
- Set minimum supported version of Python to 3.6
- Run tests in CI on 3.6, 3.7, 3.8, 3.9 and 3.10

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- Add method ``iter_long``, that performs the modified
Aho-Corasick search procedure matching the longest
words from set.

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- Add method ``iter_long``, that performs the modified
Aho-Corasick search procedure matching the longest
words from set.