Easy-thumbnails

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* Add support for Django 4.
* New ``THUMBNAIL_IMAGE_SAVE_OPTIONS`` setting.
* Fix 587: Uploading SVG Images to S3 storage.

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* Add support for thumbnailing SVG images. This is done by adding an emulation layer named VIL,
which aims to be compatible with PIL. All thumbnailing operations, such as scaling and cropping
behave like pixel images.
* Remove configuration directives ``THUMBNAIL_HIGH_RESOLUTION`` and ``THUMBNAIL_HIGHRES_INFIX``
from easy-thumbnails setting directives.

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* Add support for Django 3.2 and Python-3.10.
* Fix 563: Do not close image after loading content.
* In management command ``thumbnail_cleanup``, replace ``print``-statements
against ``stdout.write``.
* Use Python format strings whereever possible.

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* Add support for Django 3.1

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* Add support for Django 3.0
* Drop support for Python 2
* Drop support for Django < 1.11
* Drop support for Django 2.0, 2.1

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* Added testing for Django 2.2 (no code changes required).