Situation Dependent Cancellation Emails

[tpendragon]

From Jira:
Different emails for different situations when a reservation gets cancelled:
When a room is made unavailable by staff.
When the reservation has expired
When the reservation has been manually cancelled by the patron
When the reservation has been manually cancelled by staff or admins

These emails need to be configurable.

[likello]

Post release and not urgent: can we send reminder emails when patrons make a reservation X number of days in the future? Should I make a separate ticket for this request or does it make sense to keep with these?