Make a drag and drop box for activities

[Chris31415926]

Currently at Egebakken the children can on their physical weekday plan take down an activity, once they have finished it and put it into a separate box. This is to give a sense of time, so the children have a feeling of when the day is over or how far it is before they have finished work.

This should be implemented into the application, such that a citizen can drag an activity into a box in order to remove the activity. Currently drag and drop works by holding down the mouse button on an activity.