Wagtail-cache

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* Support Django installations where ``AuthenticationMiddleware`` is not enabled.
In this situation, it will behave the same as if no user is logged in.
* Packaging and documentation cleanup.

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There are no functionality changes for this release. However at this point
the package is mature and well tested enough to designate a 1.0 version.

* Support Django 3.0.
* Add unit tests, type hints, and continuous integration.

As a result of the unit tests, a few minor changes have been implemented under
the hood:

* Refactored ``wagtailcache.settings.wagtailcache_settings`` to be an object,
similar to Django ``settings``, rather than a dictionary.
* Add ``wagtailcache.cache.Status`` and ``wagtailcache.cache.CacheControl``
enums to replace hard-coded string values.
* Always set a "Cache-Control" header when skipping the cache to signal the
caching decision to upstream caches.

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* Add new management command `clear_wagtail_cache` to clear cache.
* Minor code cleanup.

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* Ignore ``Vary: Cookie`` header when caching 301, 302, 304, and 404 response codes. Always served cached responses regardless of cookies.

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* Added new middleware. This is now the recommended way of using Wagtail Cache. See :doc:`/getting_started/install`.
* The middleware will additionally cache 404 and 301/302 responses, to lighten the load on your database.
* The middleware will intelligently handle CSRF tokens and only cache those responses based on the cookie.
So the new middleware should completely eliminate any CSRF token issues while also being able to cache those pages.
* The middleware now processes all cacheable requests/responses, not just wagtail pages. To revert to previous
behavior, continue using the decorator.

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* Added new ``is_response_cacheable`` hook. See :doc:`/getting_started/hooks`.
* Never cache responses with a ``Cache-Control`` header containing ``no-cache`` or ``private``.
* New ``WagtailCacheMixin`` to support Page models with privacy or view restrictions. See :doc:`/getting_started/install`.
* Documentation updates and clarification.