Improved toolbarcontroller's event namespace assignment

Change-Id: Ic45a1162576fef3dbdb82e1427fbdd1977f8fa48
Implemented index in ChangeOpReference

(requires change I28610f2f052ff1e56630673438913832d8920b9c)
ChangeOpReference supports specifying the index of a Reference within the list of References.

Change-Id: I0941d1227c873a0d84a1d486d036644874ec1fb1
Merge changes I0941d122,Ic45a1162

* changes:
  Implemented index in ChangeOpReference
  Improved toolbarcontroller's event namespace assignment