Fixed bug with Collider not being initialised properly
Renamed Body to RotMotion

Motivation: SolidBodies are usually associated with
forces acting upon them. More like a proper physics engine.
RotMotion is to signal that this only has to do with motion and specifically we model rotation of the object in question.
Component to model class motion. Similar to RotMotion.

Motivation: RotMotion deals with angular acceleration and velocity. But for most typical cases we do not care about that and want to model velocity and acceleration directly as a vector. Hence we made this component.