We need this in addition to the Matrix (which includes translation) - mainly for rotation, which should be around the translation, but not around the origin.
There may be some places left which need changes due to this - the line between the origin and translation isn't as clear yet as it should be.
The speed isn't chosen correctly yet, but the basic movement along the spline is functional!
There are opportunities for a performance increase: Some calculations which we currently do every frame, are actually only necessary once we choose a new point for moving towards.
