User input is handled at different levels,
sometimes it is not clear what is triggered,
in this bug we want to collect all different types of events and their lifecycle,
to determine where uneccessary or wrong events are triggered.
- in QmitkRenderWindows, VTK Interaction is triggered twice (once inhertied from BaseRenderer, the other send again if event wasn't handled by mitkDispatcher) etc ...
- DisplayInteraction for 3D is triggered but does not affect the visualization,
instead it is perfomed again by VTK ...