Django-fluent-utils

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* Fixed comments SignalsStub for Django 4.0

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* Added Django 4.0 compatibility
* Removed Django 1.x compatibility code in ``fluent_utils.django_compat``.
* Renamed CommentRelation =>/CommentsRelation, but kept the old name for imports.
* Dropped Django 1.x support.
* Dropped Python 2.7 - 3.5 support.

*These changes should not affect projects that already depend on Django 2.2 / Python 3.6+.*
*Otherwise, you'll have to stay on django-fluent-utils 2.x, but it's recommended to upgrade.*

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* Fixed Windows compatibility for ``import_module_or_none()``.

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* Fixed Django 2.0 compatibility.
* Added imports for ``django.urls`` for Django 1.9- compatibility.

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* Make sure gevent import hooks are ignored in ``import_module_or_none()`` and ``import_apps_submodule()``.

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* Added ``import_module_or_none()``, which only raises an ``ImportError`` for sub modules.
* Fixed Python 3 import logic, using ``importlib`` now.
* Make sure ``TaggableManager`` has a consistent path in migration files.
* Removed ``fluent_utils.dry.models.get_db_table()`` which never worked not was used.
* Removed unneeded Django 1.4-1.6 compatibility code. Kept imports to avoid breaking old django-fluent apps.