Django-smart-admin

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* drop support Django<3.x
* fixes `reverse_object_url()`
* updates LinkedObjectsMixin:
* `get_ignored_linked_objects` renamed `get_excluded_linked_objects`
* `linked_objects_ignore` renamed `linked_objects_exclude`
* added `linked_objects_filter`
* `linked_objects_filter = None` display all reverse relations
* `linked_objects_filter = []` do not display reverse relations
* `linked_objects_filter = [a,b,...]` only display `a`,`b` reverse relations

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* add `SmartAdminSite.smart_index_template` and `SmartAdminSite.group_index_template`
* minor refactoring of `SmartAdminSite`
* fixes `LinkedObjectsMixin.linked_objects_hide_empty`
* BACKWARD INCOMPATIBLE: change signature of `get_admin_href` template tags

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* Fixes LinkedObjectsMixin

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* fixes compat Django 4.1

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* bug fixes

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* add extra panels: email, redis, error pages, sentry