Added MouseMotionControl to show node IDs when the mouse is over a node. I actually just needed that for "seeing what's going on" while trying around with the RadialSmartLayout - but thought it's a nice feature to keep. And the MouseMotionControl will be useful later for #15.
Renamed AnimationPostproduction to AnimationProduction because i am intending to  shift all animation-creation into that Class. That class will also assemble the timeline-object. That'll take all the keyframe-mess out of the Graph class. Not sure though about introducing keyframe IDs  as i was mentioning in #10. Maybe it is actually ok to reach into the model-package again to switch to another animation - no longer handing over all possible animations in one timeline-package...