Also, the part of the schedule event is deleted and the length of the event types
changes to the nearest suitable after changing the length of the interval.
This closes#1220
- Drop selected_event_schedule function
- Rename scheduled_room and scheduled_start_time to room and time as if there is no selected_schedule, the event is not scheduled.
- Only use JS for the drag&drop functionality and to the set/alter the time and rooms of the EventSchedule object.
- Introduce has_many :events, through: :event_schedules association to get unscheduled event easily
