Pmxbot

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* Refresh package metadata, fixing several DeprecationWarnings in test suite.
* Drop support for Python 3.5.
* Remove use of deprecated modules in test suite.

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* Updated the custom search engine as the old one was discarded
when jaraco had to replace his G-Suite hosted account with a
regular one.

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* Workaround use of ``importlib_resources`` in phrases due
to `importlib_resources 68
<https://gitlab.com/python-devs/importlib_resources/issues/68>`_.

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* Fixed issues with resource loading in web viewer.

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* 84: Corner cases in ``!stack`` command.
* 84: Added ``list`` alias to stack command.
* Refresh project metadata including using declarative config.
* Cleaned up deprecation warnings.
* 82: Use ``DangerousDumper`` for compatibility with PyYAML 3.12.
* Switched to using ``entrypoints``, ``importlib_metadata``,
and ``importlib_resources`` instead of ``pkg_resources``.

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* 83: Added ``!stack`` command.