Feincms3-forms

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- Removed testing for Django older than 4.2.
- Allowed setting a maximal length for URL and email fields.

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- Increased the test coverage.
- Defined default content editor button icons for simple fields.
- Switched to hatchling and ruff.
- Added testing using Django 4.2, 5.0, 5.1 and Python 3.11, 3.12.

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.. _0.3: https://github.com/matthiask/feincms3-forms/compare/0.2...0.3

- Added multiple select and multiple checkboxes field types to the simple field
base.
- Changed the ``SELECT`` simple field type to use the placeholder field to
replace the default empty choices string if set.
- Renamed ``SimpleFieldBase.get_fields`` to ``SimpleFieldBase.get_field`` to
enable better code reuse without ``super()``.

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.. _0.2: https://github.com/matthiask/feincms3-forms/compare/0.1...0.2

- Changed ``ConfiguredForm.get_formfields_union`` to allow fetching arbitrary
attributes from plugins, completely changed the return value to a list of
``(name, {...attributes...})`` tuples, made validation utilities work with
this new data structure.

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- Time to leave the zero.zero.whatever versions behind!


.. _0.1: https://github.com/matthiask/feincms3-forms/commit/93cba055a85