Uritools

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- Prepare for Python 3.13.

===================

- Depend on Python >= 3.7.

- Support Python 3.12.

===================

- Add support for Python 3.11.

- Correct version information in RTD documentation.

- ``badges/shields``: Change to GitHub workflow badge routes.

===================

- Require Python 3.7 or later (breaking change).

- Remove undocumented submodules (breaking change).

The ``chars``, ``classify``, ``compose``, ``defrag``, ``encoding``,
``join`` and ``split`` submodules have been deleted. Therefore,
statements like

``from uritools.classify import isuri``

will no longer work. Use

``from uritools import isuri``

instead.

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- Update build environment.

===================

- Do not convert percent-encodings to uppercase in host components
generated by ``uricompose()``.

- Officially support Python 3.9.

- Format code with Black.