ECOM-2933

Please note that this is a squshed commit and the work of:
Symbolist, macdiesel, nedbat, doctoryes, muzaffaryousaf and muhammad-ammar

ECOM-2552

add new column 'copy_id_photo_from' for 'SoftwareSecurePhotoVerification' model to track initial verification with 'photo_id_key'

XCOM-285

These signals are caught by the Teams app and used to update
`last_activity_at` on both teams and individual users.

TNL-2497

Create read-only serializer to handle User/UserProfile data
together.

Refactor GET accounts to use the new read-only joint serializer

Fix tests to check for new expanded user info

Update tests in teams/tests/test_views.py to test for both
public and private profiles on expands user

Update serializer to utilize the request object for creating absolute uris

* Combine verification and reverification photo submission end-points.
* Combine verification and reverification Backbone models.
* Allow deletion of verification status in Django admin.
* Initial verification from a checkpoint is associated with the checkpoint.
* Fix critical bug in which an invalid link was sent to Software Secure
  for the photo ID image of reverification attempts.

* Add verification deadline model.
* Populate verification deadlines from course modes table.
* Update student dashboard to use verification deadlines.
* Update pay-and-verify view to use verification deadlines.
* Simplify Django admin for course modes and add validation.
* Add verification deadline to Django admin for course modes.
* Add UI for when the upgrade deadline is missed in the pay-and-verify flow.

Add context for navigation states
added find course to dashboard sidebar and included check for context that Will adds in PR
removed nav_course_search context due to design change so replaced with nav_hidden
Removed rwd_header.js and all references as no longer being used.

Wrapped Find Courses in dashboard sidebar in if statement

ECOM-1734

Adds standardized audit logging for checkout and enrollment change requests. XCOM-427.

TNL-2465

* Delete reverification templates
* Delete photocapture.js
* Delete unused "name change" end-points
* Rebuild the reverification views using Backbone sub-views
* Stop passing template names to the JavaScript code
* Avoid hard-coding the parent view ID in the webcam view (for getting the capture click sound URL)

ECOM-1612

XCOM-287

We are moving toward a single workflow for verification.

XCOM-213 XCOM-214