Django-filer

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* Fix 1214: `serve()` missing 1 required positional argument: `filer_file`.
* Fix 1211: On upload MIME-type is not set correctly.

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* Fixed NotNullViolation: null value in column "mime_type" in migration
``filer.0012_file_mime_type.py``.

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* Added support for Django 3.1
* Dropped support for Python 2.7 and Python 3.4
* Dropped support for Django < 2.2
* Changed the preferred way to do model registration via model inheritance
and ``mptt.AlreadyRegistered``, which is deprecated since django-mptt 0.4
* Use dashed name for django-polymorphic dependency in setup.py
* In ``models.File``, add field ``mime_type`` to store the Content-Type as set by
the browser during file upload
* For extended Django Filer models, adopt the classmethod ``matches_file_type`` to its
new signature, this is a breaking change
* Add attribute ``download`` to the download link in order to offer the file
under its original name

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* Fix problem with loading jquery.js after jquery.min.js had been loaded.
* Fix usability: Upload files into most recently used folder, instead of
root folder.

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* Added Django 3.0 support
* Added support for Python 3.8
* Add attribute ``download`` to the download link in order to offer the file
under its original name.

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* Removed support for Django <= 1.10
* Removed outdated files
* Code alignments with other addons
* Replace deprecated templatetag ``staticfiles`` against ``static``.
* Added management command ``filer_check`` to check the integrity of the
database against the file system, and vice versa.
* Add jQuery as AdminFileWidget Media dependency
* Add rel="noopener noreferrer" for tab nabbing
* Fixed an issue where a value error is raised when no folder is selected
* Fixed search field overflow