Z3c.unconfigure

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- Nothing changed yet.

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* Add support for Python 3.12, 3.13.

* Drop support for Python 3.7.

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* Drop support for Python < 3.7.

* Add support for Python 3.7, 3.8, 3.9, 3.10, 3.11.

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* Added support for zope.configuration 3.8.0, which changed the internal
data structures from tuples to dicts.

* Dropped support for zope.configuration 3.7.x and older.

* Unconfiguring an entire zcml file (include statement inside an unconfigure
block) now works.

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* Added a ``meta.zcml`` file so that the ``<unconfigure>`` directive
can actually be registered from ZCML.

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First public release.