QmlDesigner: rewrite statelistview

Change-Id: I2d2481e2f1a3e0f2d4a5807712e9435b3009e52d
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
QmlDesigner: rename nodeId -> internalNodeId

Change-Id: I8f038479f31a282db256144a3254e438eb6a629f
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
QmlDesigner: fix stateslistview sizeHint

Change-Id: I86147f80a81ff9095c67bcb296488a2a7345434a
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
QmlDesigner: styling stateslistview

Change-Id: I29d39230bd1f37cb3d57b14045717d893f51e122
Reviewed-by: Marco Bubke <marco.bubke@digia.com>