(bug 44745) Detaching toolbar from claimview widget

The change set adds a new edittoolbar widget which basically acts as a wrapper for a
widget offering edit functionality. All direct toolbar references are removed from
the claimview widget with the interaction between the claimview widget and the toolbar
widget being managed via events.
Direct toolbar references will also be removed from the claimlistview and listview
widgets in an upcoming change set.

patch set 2:
 Removed newly added functions representing 'after' events again since those functions
 should not be public and do not have any real purpose within the claimview.

Change-Id: I744188846494211527402c85a2d3e482d31ee245