Opening a the dialog marks the file modified

Steps to reproduce:

• Open a file in IVE or DVE
• Double click on a component to open the properties dialog
  -> The file is marked as modified (*)

Note: Reason is, that VERectGraphicsItem::onManualMoveFinish() is called.
Maybe check if the data really changed in VEInteractiveObject::updateEntity(). And only update if the data changed.