QmlDesigner: add reload feature to stateseditor

Change-Id: I61fc9fb05dc901765c1c348cfab29b3d2eaa7516
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
QmlDesigner: remove unused signal

Change-Id: Iff710bcc666db41ef89d4912f8136bcf3ca4eb0c
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
QmlDesigner: remove old unnecessary work arounds

Change-Id: Ic864ff707e942fe7bba13cb29fd288ab2abfc913
Reviewed-by: Marco Bubke <marco.bubke@digia.com>