This:
1. Introduces a new override using the `pluggable_override` decorator.
It is now possible to specify a custom way of getting XBlock's icon
by defining `GET_UNIT_ICON_IMPL` in settings.
2. Introduces a way to add custom `XBLOCK_MIXINS` by defining
`XBLOCK_EXTRA_MIXINS` in settings. This allows, e.g. to add
new fields to XBlocks.
The docs configuration files previously had to account
for the fact that lms/djangoapps, cms/djangoapps, and
common/djangoapps were hacked into sys.path. As of ~Lilac,
this is no longer the case.
Unrelated cleanup: devstack_docker and devstack
are now aliases, so we can simplify a conditional import
in docs_settings.py
Removed most of the deprecated shoppingcart app, leaving just enough to allow us to cleanly remove the related database tables later. Also removed the relevant Django settings that weren't in use elsewhere.
* Moving plugins infrastructure to edx-django-utils
This PR extracts the code that enables plugins in edx-platform and puts it in edx-django-utils. This is done to allow other IDAS to add plugin functionality.
[TNL-7051] Clicking a video XBlock's fullscreen button now takes the video fullscreen instead of full window.
Gracefully fallback to full window if fullscreen apis are absent
