Megrok.strictrequire

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- Nothing changed yet.

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- Fix how PEP 420 namespace is used in ``setup.py``.

- Add support for Python 3.13.

- Drop support for Python 3.7, 3.8.

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- Drop support for explicit (pkg_resources) namespaces and replace it with
an implicit (PEP 420) namespace.

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- Drop support for Python 2.7, 3.4, 3.5, 3.6.

- Drop support for ``grok < 5``, thus dropping support for JSON, REST and
XMLRPC.

- Add support for Python 3.7, 3.8, 3.9, 3.10, 3.11, 3.12.

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- Python 3 compatibility.

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- Dependencies update in preparation of Python2/3 migration.