Zlib-ng

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+ Fix a reference counting error that happened on module initialization and
triggered an error in the CPython debug build.
+ Fix a setup.py error that was triggered on MacOS ARM64.

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+ Fix a bug where streams that were passed to gzip_ng_threaded.open where
closed.
+ Fix compatibility with Python 3.13

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+ Add a ``gzip_ng_threaded`` module that contains the ``gzip_ng_threaded.open``
function. This allows using multithreaded compression as well as escaping the
GIL.
+ The internal ``gzip_ng._GzipReader`` has been rewritten in C. As a result the
overhead of decompressing files has significantly been reduced.
+ The ``gzip_ng._GzipReader`` in C is now used in ``gzip_ng.decompress``. The
``_GzipReader`` also can read from objects that support the buffer protocol.
This has reduced overhead significantly.
+ Fix some unclosed buffer errors in the gzip_ng CLI.

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+ Source distributions on Linux now default to building with configure and
make as it is faster and has less dependencies than CMake.
+ Python 3.12 support was added. Python 3.7 support was dropped as it is end
of life.
+ Enabled installation on BSD
+ Update embedded zlib-ng version to 2.1.5. This comes with some speed
improvements and changes with regards to the compression levels. Also
several bugs were fixed. For full
details checkout the `zlib-ng 2.1.2 release notes
<https://github.com/zlib-ng/zlib-ng/releases/tag/2.1.2>`_ as well as

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+ Build wheels for all three major operating systems.
+ Add a fully featured gzip application in python m zlib_ng.gzip_ng.
+ Port Cpython's gzip module to use zlib-ng.
+ Port CPython's zlib module to use zlib-ng.
+ Use zlib-ng version 2.0.6 as included statically linked version.