ASAP: Allow cancelled events to be dragged out of the daily planning

This will allow the schedule of new appointments or other assessment in that time slot.

added enhancement high priority important labels

mentioned in commit a4b920d6

mentioned in merge request !214 (merged)

added Done label

mentioned in commit 7e753b73

closed via merge request !218 (merged)

closed via commit a4b920d6

mentioned in commit c0e5b052