Note that the features in this release are opt-in, and course and video
behavior will remain the same unless a course explicitly opts in.

Major pieces of functionality with this commit:

Allows the listing of a user's enrollments, course videos, and updates. In
order to make a course available for mobile use, course staff must explicitly
set the Course Advanced Setting "Mobile Course Available" to true. Course staff
will always see their own courses through the Mobile API regardless of this
setting, but students will only be allowed to see a course through the Mobile
API if this setting is set to "true". By default, a Course will *not* be
available for mobile use.

This is a Django app for video resource management. It is completely optional,
and is intended to allow video and operations teams to create new encodings of
videos (e.g. low res for mobile) and change CDNs without having to edit course
data directly. Course teams can now use a "EdX Video ID" setting for Videos,
which will leverage VAL. Video units that do not fill in an "EdX Video ID" will
behave exactly as they always have.

* The Mobile API is enabled with the ENABLE_MOBILE_REST_API feature flag.
* VAL is enabled with the ENABLE_VIDEO_ABSTRACTION_LAYER_API feature flag.
* VAL and the Mobile API both require ENABLE_OAUTH2_PROVIDER).
* The Mobile API is a read-only API, but VAL requires database migrations.
* Applications that make use of either the Mobile API or VAL must be registered
  with the OAuth2 provider app in Django Admin.

Deployed as hotfix

add tests for static tabs

write failing tests for info page banner

Revert the changes from PR 5152

Annotation Tools: Adding Try-Catch for anonyous_student_id issue in staging

Add edX OAuth2 provider with OpenID Connect support

 - changed message and added i18n

The changes in 5152 appear to have introduced a
 performance problem on stage, so we're going to
 revert them for now.

For microsites, since we don't have a footer override yet for django tem...

Calling the client root was causing the module store to be modified,
affecting test in other Django applications that rely on the default
state of the module store.

Some tests test were using `CourseFactory` buy not deriving from
`ModuleStoreTestCase`, introducing a course leaks that broke other
unrelated tests.

For microsites, since we don't have a footer override yet for django templates, remove the footer all together

This reverts commit 3f159ea5.

Merging.

allow TAs to select the cohort of new posts.

TNL-153

Ex-74 Registration Code redemption

Pyfilesystem fix for AWS. pyfs has broken logic which did not work with AWS roles-based auth. This removes that logic. 

Fixed bok choy flaky test for studio.

EX-81 / Ex-84 changes

Update translations (autogenerated message)

Update github for asset char

LMS-11380

TE-468 JS test: Use the correct array for validating onSeek logs

TNL-284

fix the translation issues

added a check if a user is already registered in a course. Changed the messages

added course depth=0 and removed pep8 violations

only redirect to dashboard if user has course enrollments, otherwise rem...

Updated Files & Uploads template help

only redirect to dashboard if user has course enrollments, otherwise remain on the course catalog page (aka homepage or root)

update lettuce test to match new expected behavior

add Jason's feedback

only apply new redirect logic for microsites

switch to use a feature flag to determine whether to support redirect behavior

To include size warning of 10 MB.  Also updated styling on existing learn more
links

Updating active_versions should not send old and new