Packaging2

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* Fork of v21.3 to packaging2 as a workaround of https://github.com/pypa/packaging/issues/530
and reinstate support for LegacyVersion and LegacySpecifier

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* Add a ``pp3-none-any`` tag (`311 <https://github.com/pypa/packaging/issues/311>`__)
* Replace the blank pyparsing 3 exclusion with a 3.0.5 exclusion (`481 <https://github.com/pypa/packaging/issues/481>`__, `#486 <https://github.com/pypa/packaging/issues/486>`__)
* Fix a spelling mistake (`479 <https://github.com/pypa/packaging/issues/479>`__)

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* Update documentation entry for 21.1.

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* Update pin to pyparsing to exclude 3.0.0.

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* PEP 656: musllinux support (`411 <https://github.com/pypa/packaging/issues/411>`__)
* Drop support for Python 2.7, Python 3.4 and Python 3.5.
* Replace distutils usage with sysconfig (`396 <https://github.com/pypa/packaging/issues/396>`__)
* Add support for zip files in ``parse_sdist_filename`` (`429 <https://github.com/pypa/packaging/issues/429>`__)
* Use cached ``_hash`` attribute to short-circuit tag equality comparisons (`417 <https://github.com/pypa/packaging/issues/417>`__)
* Specify the default value for the ``specifier`` argument to ``SpecifierSet`` (`437 <https://github.com/pypa/packaging/issues/437>`__)
* Proper keyword-only "warn" argument in packaging.tags (`403 <https://github.com/pypa/packaging/issues/403>`__)
* Correctly remove prerelease suffixes from ~= check (`366 <https://github.com/pypa/packaging/issues/366>`__)
* Fix type hints for ``Version.post`` and ``Version.dev`` (`393 <https://github.com/pypa/packaging/issues/393>`__)
* Use typing alias ``UnparsedVersion`` (`398 <https://github.com/pypa/packaging/issues/398>`__)
* Improve type inference for ``packaging.specifiers.filter()`` (`430 <https://github.com/pypa/packaging/issues/430>`__)
* Tighten the return type of ``canonicalize_version()`` (`402 <https://github.com/pypa/packaging/issues/402>`__)

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* Run `isort <https://pypi.org/project/isort/>`_ over the code base (`#377 <https://github.com/pypa/packaging/issues/377>`__)
* Add support for the ``macosx_10_*_universal2`` platform tags (`379 <https://github.com/pypa/packaging/issues/379>`__)
* Introduce ``packaging.utils.parse_wheel_filename()`` and ``parse_sdist_filename()``
(`387 <https://github.com/pypa/packaging/issues/387>`__ and `#389 <https://github.com/pypa/packaging/issues/389>`__)