Django-siteforms

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+ Support filtering of one field with two multiple filters.
+ Support multiple field values for filtering.

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+ Add support for fields for model properties (closes 10).
* Allow getting 'widgets_readonly' for forms without Meta (closes 8).
* Json subforms serialization improved (support date-related, decimal, uuid fields) (closes 9).
* Now forms handle both data/files given in args/kwargs and fetched from 'request'+'src' (closes 11).

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! Dropped QA for Python 3.6.
+ Add 'opt_feedback_valid' for Bootstrap 4, 5 (closes 6).
+ Add 'target_url' form parameter (closes 7).
+ Add basic support for filtering forms (closes 5).
+ Add support for Bootstrap 5 (closes 4).
* Do not leak CSRF token for GET (closes 3).
* Rename SubformBoundField -> EnhancedBoundField.

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* Django 4.0 compatibility improved.

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+ Added support for append operation for attrs.
+ Added support for Form.Meta.widgets_readonly.

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+ ReadOnlyWidget now can represent ModelMultipleChoiceField.
* Add hidden fields for custom layout without ALL_FIELDS.
* Fix 'render_form_tag' handling for Bootstrap 4.
* Improved disable, readonly and hidden fields handling.
* Improved multipart form detection and files passing to subforms.