Setuptools

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Breaking Changes
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* 2094: Setuptools now actively crashes under Python 2. Python 3.5 or later is required. Users of Python 2 should use ``setuptools<45``.

Changes
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* 1700: Document all supported keywords by migrating the ones from distutils.

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Changes
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* 1753: ``attr:`` now extracts variables through rudimentary examination of the AST,
thereby supporting modules with third-party imports. If examining the AST
fails to find the variable, ``attr:`` falls back to the old behavior of
importing the module. Works on Python 3 only.

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No significant changes.

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Changes
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* 2089: Package index functionality no longer attempts to remove an md5 fragment from the index URL. This functionality, added for distribute 163 is no longer relevant.

Misc
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* 2041: Preserve file modes during pkg files copying, but clear read only flag for target afterwards.
* 2105: Filter ``2to3`` deprecation warnings from ``TestDevelop.test_2to3_user_mode``.

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Changes
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* 2040: Deprecated the ``bdist_wininst`` command. Binary packages should be built as wheels instead.
* 2062: Change 'Mac OS X' to 'macOS' in code.
* 2075: Stop recognizing files ending with ``.dist-info`` as distribution metadata.
* 2086: Deprecate 'use_2to3' functionality. Packagers are encouraged to use single-source solutions or build tool chains to manage conversions outside of setuptools.

Documentation changes
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* 1698: Added documentation for ``build_meta`` (a bare minimum, not completed).

Misc
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* 2082: Filter ``lib2to3`` ``PendingDeprecationWarning`` and ``DeprecationWarning`` in tests,
because ``lib2to3`` is `deprecated in Python 3.9 <https://bugs.python.org/issue40360>`_.

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No significant changes.