Setuptools

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Documentation changes
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* 2584: Added ``sphinx-inline-tabs`` extension to allow for comparison of ``setup.py`` and its equivalent ``setup.cfg`` -- by :user:`amy-lei`

Misc
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* 2592: Made option keys in the ``[metadata]`` section of ``setup.cfg`` case-sensitive. Users having
uppercase option spellings will get a warning suggesting to make them to lowercase
-- by :user:`melissa-kun-li`

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Changes
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* 1608: Removed the conversion of dashes to underscores in the :code:`extras_require` and :code:`data_files` of :code:`setup.cfg` to support the usage of dashes. Method will warn users when they use a dash-separated key which in the future will only allow an underscore. Note: the method performs the dash to underscore conversion to preserve compatibility, but future versions will no longer support it -- by :user:`melissa-kun-li`

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Breaking Changes
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* 2582: Simplified build-from-source story by providing bootstrapping metadata in a separate egg-info directory. Build requirements no longer include setuptools itself. Sdist once again includes the pyproject.toml. Project can no longer be installed from source on pip 19.x, but install from source is still supported on pip < 19 and pip >= 20 and install from wheel is still supported with pip >= 9.

Changes
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* 1932: Handled :code:`AttributeError` by raising :code:`DistutilsSetupError` in :code:`dist.check_specifier()` when specifier is not a string -- by :user:`melissa-kun-li`
* 2570: Correctly parse cmdclass in setup.cfg.

Documentation changes
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* 2553: Added userguide example for markers in extras_require -- by :user:`pwoolvett`

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Changes
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* 1937: Preserved case-sensitivity of keys in setup.cfg so that entry point names are case-sensitive. Changed sensitivity of configparser. NOTE: Any projects relying on case-insensitivity will need to adapt to accept the original case as published. -- by :user:`melissa-kun-li`
* 2573: Fixed error in uploading a Sphinx doc with the :code:`upload_docs` command. An html builder will be used.
Note: :code:`upload_docs` is deprecated for PyPi, but is supported for other sites -- by :user:`melissa-kun-li`

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Breaking Changes
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* 1527: Removed bootstrap script. Now Setuptools requires pip or another pep517-compliant builder such as 'build' to build. Now Setuptools can be installed from Github main branch.

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Breaking Changes
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* 2537: Remove fallback support for fetch_build_eggs using easy_install. Now pip is required for setup_requires to succeed.
* 2544: Removed 'easy_install' top-level model (runpy entry point) and 'easy_install' console script.
* 2545: Removed support for eggsecutables.

Changes
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* 2459: Tests now run in parallel via pytest-xdist, completing in about half the time. Special thanks to :user:`webknjaz` for hard work implementing test isolation. To run without parallelization, disable the plugin with ``tox -- -p no:xdist``.