Order / Transaction Status Notifications

[thomasplevy]

• [x] Recurring transaction payment failed (email: student & custom) -- v3.10
• [ ] Order status change (old status -> new status) (email: custom)
• [x] Manual Payment Invoice (w/ next steps) -- v3.10
• [ ] Recurring payment due in X days
• [ ] access period expires
• [ ] order refund processed

[thomasplevy]

bumping remaining items to a future release