TNL-735

Fixed the edX middleware to lazily create request
context for Mako templates, so that it is based on
any changes made to the request object.

Verified that with this fix the "Instructor" tab is
correctly hidden when a staff member is viewing
the course as a student.

OPEN-328

OPEN-328

spinner.gif and spinner-on-grey.gif are the same file.
Explicitly give the LMS a spinner.gif file.

OPEN-328

OPEN-328

OPEN-328

Move app-generated context back into properties.
Ignore BI events through segment's webhook.
Ignore events without Data in Properties.

This commit puts a limit on the size of files that
course staff can upload to MongoDB. The limit is
enforced on the frontend in javascript as well
as backend via the /upload endpoint.

The limit is hard-coded in cms/envs/common.py and
may be changed according to the user's custom
needs.

If the user tries to upload a file that's too
large, an error message will pop up, with a
customizable url that pointing the user to an
external page with an alternate upload procedure.
This url is specified im cms/envs/common.py.
If not set, this url will not be displayed.

Assert mistakenly had comma instead of double-equal - now correct.

add retire method to order class

TNL-892

Remove items from the shopping cart if they are for a course whose course enrollment window has closed

changed the url name to verify_cart and change the color of the message in the shopping cart

Fix all the 3rd party auth scenarios.

Update pipeline to preserve parameters.

Updating tests

Updates copy used in the checkbox label, constructs strings within the view instead of passing through a separate context variable, and alleviates unipain