DTGOV-4 Deployment target configuration/management UI

The implementation is more or less the same than in the WorkflowQueries.

In the implementation done, as in the WorkflowQueries, the widget that fires the Delete Event is the Delete Modal Dialog. When the user clicks on Delete confirmation button, then the event is fired.

The mechanism is little bit different as what you propose:
- In the Table, when the user clicks on the Delete button, then the Modal Popup is displayed.
- The modal popup delete the Target when the confirmation button is clicked and, then the Delete event is fired.