Django-bs

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- add support for Django 4.x
- fix rendering of hidden fields in `bootstrap_form`
- overwrite the default form template so that `{{ form }}` will produce the
same output as `{% bootstrap_form form %}` (starting with Django 4.0)
- starting with Django 4.0, make use of `widget.use_fieldset`
- use same font size for `<legend>` as for `<label>`
- work around extensive spacing between legend and multiwidget

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- adapt to bootstrap 5

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- use underscore in app name
- help text and error inside form-check
- use fieldsets where appropriate (django 32338)
- change versioning to align with bootstrap
- change package name to "django-bs" and tag library name to "bootstrap".

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- clearable file input
- fix line break
- fix disable checkbox when disabled (django 31536)
- fix use bootstrap styling

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- Fix `radio_option` include path

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- Fix some infos in setup.py