improved RestrainingPosition() method:
- position is now forced in addition to negation of the velocity
- added more realistic looking damping
- moved the call out of the loop of NaiveCollisionDetection()

InitTweakBar()
- added "Reset" and "Time Step Size" to each g_pSpecialTweakBar because TweakBars will overlap when resetting -> annoying (change position?)

Reorganized Setter for Tweakbar
Removed MassspringSystem.ccp/.h from Projekt because they were not (properly) added. Couldn't be found.