Wrong item play/stop after drag-drop sorting

In some cases when items are deleted and/or sorted on the rundown the play/cont/stop commands effect the neighbouring item instead.

The root cause of this is the identification mechanism in the rundown view and it will need to be re-written to be based on UUID's, planned for 1.1.

Workaround: reload the view (F5 / Ctrl+R) after delete or sort.