Html-text

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* Fixed HTML comment and processing instruction handling.
* Use ``lxml-html-clean`` instead of ``lxml[html_clean]`` in setup.py,
to avoid https://github.com/jazzband/pip-tools/issues/2004

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* Moved the Git repository to https://github.com/zytedata/html-text.
* Added official support for Python 3.9-3.12.
* Removed support for Python 2.7 and 3.5-3.7.
* Switched the ``lxml`` dependency to ``lxml[html_clean]`` to support
``lxml >= 5.2.0``.
* Switch from Travis CI to GitHub Actions.
* CI improvements.

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* Handle lxml Cleaner exceptions (a workaround for
https://bugs.launchpad.net/lxml/+bug/1838497 );
* Python 3.8 support;
* testing improvements.

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Fixed whitespace handling when ``guess_punct_space`` is False: html-text was
producing unnecessary spaces after newlines.

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Parsel dependency is removed in this release,
though parsel is still supported.

* ``parsel`` package is no longer required to install and use html-text;
* ``html_text.etree_to_text`` function allows to extract text from
lxml Elements;
* ``html_text.cleaner`` is an ``lxml.html.clean.Cleaner`` instance with
options tuned for text extraction speed and quality;
* test and documentation improvements;
* Python 3.7 support.

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Fixed a regression in 0.4.0 release: text was empty when
``html_text.extract_text`` is called with a node with text, but
without children.