Setuptools

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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.

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Changes
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* 479: Remove some usage of the deprecated ``imp`` module.

Misc
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* 1565: Changed html_sidebars from string to list of string as per
https://www.sphinx-doc.org/en/master/changes.html#id58