Determines whether the events on the calendar can be modified.
This determines if the events can be dragged and resized. Enables/disables both at the same time. If you don’t want both, use
editable in conjunction with eventStartEditable and eventDurationEditable.
This option can be overridden on a per-event basis with the Event Object
editable property. However, Background Events can not be dragged or resized.
Prior to version 1.3, the draggable option was used instead.