Setuptools

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Documentation changes
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* 2394: Extended towncrier news template to include change note categories.
This allows to see what types of changes a given version introduces
-- by :user:`webknjaz`
* 2427: Started enforcing strict syntax and reference validation
in the Sphinx docs -- by :user:`webknjaz`
* 2428: Removed redundant Sphinx ``Makefile`` support -- by :user:`webknjaz`

Misc
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* 2401: Enabled test results reporting in AppVeyor CI
-- by :user:`webknjaz`
* 2420: Replace Python 3.9.0 beta with 3.9.0 final on GitHub Actions.
* 2421: Python 3.9 Trove classifier got added to the dist metadata
-- by :user:`webknjaz`

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Documentation changes
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* 2093: Finalized doc revamp.
* 2097: doc: simplify index and group deprecated files
* 2102: doc overhaul step 2: break main doc into multiple sections
* 2111: doc overhaul step 3: update userguide
* 2395: Added a ``:user:`` role to Sphinx config -- by :user:`webknjaz`
* 2395: Added an illustrative explanation about the change notes to fragments dir -- by :user:`webknjaz`

Misc
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* 2379: Travis CI test suite now tests against PPC64.
* 2413: Suppress EOF errors (and other exceptions) when importing lib2to3.

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Changes
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* 2368: In distutils, restore support for monkeypatched CCompiler.spawn per pypa/distutils15.

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Changes
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* 2355: When pip is imported as part of a build, leave distutils patched.
* 2380: There are some setuptools specific changes in the
``setuptools.command.bdist_rpm`` module that are no longer needed, because
they are part of the ``bdist_rpm`` module in distutils in Python
3.5.0. Therefore, code was removed from ``setuptools.command.bdist_rpm``.

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Changes
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* 2350: Setuptools reverts using the included distutils by default. Platform maintainers and system integrators and others are *strongly* encouraged to set ``SETUPTOOLS_USE_DISTUTILS=local`` to help identify and work through the reported issues with distutils adoption, mainly to file issues and pull requests with pypa/distutils such that distutils performs as needed across every supported environment.

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Misc
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* 2363: Restore link_libpython support on Python 3.7 and earlier (see pypa/distutils9).