* Refactor several related endpoints and views
* Redesign EnrollmentView, add TeacherContactModal
* Add "Enrollment Status" tab to TeacherClassView
* Delete PurchaseCoursesView and related files
* Style-flatten RemoveStudentModal
* Fix error handling in ActivateLicensesModal
* TeacherCoursesView loads faster by only loading course campaigns, and not load prepaids
Admins can generate a prepaid code, which a user can use to subscribe
for free via the account/subscription page.
The subscription will be identical to the normal monthly subscription
(e.g. 3500 gems per month), except they won’t be charged.
Does not require the recipient to enter billing information.
Can be applied to an existing subscription, which will be converted to
free.
Prepaid code can only be used once.
Prepaid subscription cannot be unsubscribed via the UI.
