Add custom notification variables for course start/end times

Add custom notification variables for course start/end times

We use scheduled custom notifications for instructor/blended courses as reminders for students. It would be very helpful to have a variable (like @class_name) that references the scheduled start and end times of the course. For example, I would like students to be able to see information like "Tuesday from 9:00am to 4:00pm" in their reminder notifications.