Setuptools

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Breaking Changes
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* 1830, 1909: Mark the easy_install script and setuptools command as deprecated, and use `pip <https://pip.pypa.io/en/stable/>`_ when available to fetch/build wheels for missing ``setup_requires``/``tests_require`` requirements, with the following differences in behavior:
* support for ``python_requires``
* better support for wheels (proper handling of priority with respect to PEP 425 tags)
* PEP 517/518 support
* eggs are not supported
* no support for the ``allow_hosts`` easy_install option (``index_url``/``find_links`` are still honored)
* pip environment variables are honored (and take precedence over easy_install options)
* 1898: Removed the "upload" and "register" commands in favor of :pypi:`twine`.

Changes
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* 1767: Add support for the ``license_files`` option in ``setup.cfg`` to automatically
include multiple license files in a source distribution.
* 1829: Update handling of wheels compatibility tags:
* add support for manylinux2010
* fix use of removed 'm' ABI flag in Python 3.8 on Windows
* 1861: Fix empty namespace package installation from wheel.
* 1877: Setuptools now exposes a new entry point hook "setuptools.finalize_distribution_options", enabling plugins like :pypi:`setuptools_scm` to configure options on the distribution at finalization time.

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Changes
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* 479: Replace usage of deprecated ``imp`` module with local re-implementation in ``setuptools._imp``.

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Changes
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* 1891: Fix code for detecting Visual Studio's version on Windows under Python 2.

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Changes
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* 1811: Improve Visual C++ 14.X support, mainly for Visual Studio 2017 and 2019.
* 1814: Fix ``pkg_resources.Requirement`` hash/equality implementation: take PEP 508 direct URL into account.
* 1824: Fix tests when running under ``python3.10``.
* 1878: Formally deprecated the ``test`` command, with the recommendation that users migrate to ``tox``.

Documentation changes
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* 1860: Update documentation to mention the egg format is not supported by pip and dependency links support was dropped starting with pip 19.0.
* 1862: Drop ez_setup documentation: deprecated for some time (last updated in 2016), and still relying on easy_install (deprecated too).
* 1868: Drop most documentation references to (deprecated) EasyInstall.
* 1884: Added a trove classifier to document support for Python 3.8.

Misc
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* 1886: Added Python 3.8 release to the Travis test matrix.

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Changes
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* 1847: In declarative config, now traps errors when invalid ``python_requires`` values are supplied.

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Changes
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* 1690: When storing extras, rely on OrderedSet to retain order of extras as indicated by the packager, which will also be deterministic on Python 2.7 (with PYTHONHASHSEED unset) and Python 3.6+.

Misc
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* 1858: Fixed failing integration test triggered by 'long_description_content_type' in packaging.