ARCH-193

This reverts commit 370501d1.

These are old feature flags that are no longer used:

ENABLE_MANUAL_GIT_RELOAD was to allow instructors to reload an XML
Modulestore course directly from a git checkout. That Modulestore
backend hasn't existed for a while.

DEBUG_LEVEL was an early flag for how debug log verbosity.

USE_YOUTUBE_OBJECT_API was created in reaction to YouTube breaking
their iframe API. They have long since addressed those issues.

Enable the journal app in LMS. Add support to display Journals on index
and courseware pages and dashboard.

LEARNER-5620

There are other annotations features still in the platform but this one
is the one that works with an annotations server that was specialized
and not generally used by most instances of the platform.

The initial PR to remove this was made by 'lduarte1991' and can be found
here: https://github.com/edx/edx-platform/pull/17299

The work done based on the squashed commits:
removed advanced modules config for annotations
remove module files and config for annotations
remove js and css files related to annotations, under ova folders
removed js and css annotator file configs for cms and lms
remove template html files for annotations
removed annotations options from static html book
Added back some files that were originally marked "for OVA" but others used as per acceptance tests
Added back css file configs incorrectly marked as ova
Remove annotation related advanced settings from test.
Correct hls require.js pathing.

There was an issue with migrations on sandboxes.

This reverts commit 58f6e925

 - ENT-1070

This will retire a refresh token and access token pair in the DOT tables
if the access token is 6 months expired (prior to that, the refresh
token still works).

- Change retire mailings endpoint to use new USER_RETIRE_THIRD_PARTY_MAILINGS signal, currently only used by Sailthru retirement
- Move USER_RETIRE_MAILINGS signal firing to the LMS misc endpoint
- Remove duplicate clearing of UserOrgTags
- Remove LMS imports in openedx/core and update usage to use new USER_RETIRE_LMS_CRITICAL and USER_RETIRE_LMS_MISC signals
- Add testing for new signal handlers and app registration for the LMS survey app

These were very early experiments by the old performance team
on using CDNs for videos and logging performance data.  No one
is looking at this data and it's just extra cruft on every page.

This patch would ratelimit registration form validation
endpoint for anonymous user based on his/her ip.

LEARNER-3810

It is always on now, and this is just a deprecated stub which will be
removed in Django 2.0.

It is now possible to limit the number of rows in the problem response csv

Site Configuration and feature flag

When set, it hides the Courses list on the Learner Dashboard page if the
learner has not yet activated their account.

(cherry picked from commit 22ee400b)

and removes the DISPLAY_ACCOUNT_ACTIVATION_MESSAGE_ON_SIDEBAR flag, since this
feature is now always on.

Marks the top banner as deprecated.

(cherry picked from commit b44114d1)

Moved the ID string used in the google-site-verification meta tag to settings so that it can be overridden from site_configuration.

It looks like this was part of the original rollout of the microsites
feature back in December 2013 [1], but was quickly removed in February
2014 [2]. These references have been orphaned ever since.
I can find no other references to it in the platform, save these.

[1] a3211a74
[2] aa43689a

Update support form to auto select course and make course
selection required to submit form.

LEARNER-4254