The PathMovementSwitchSystem was repurposed to a general InteractivePathSystem for this. It handles switching and adding points, as both seem like sensible possibilities for such entities to have.
Not working because linearly increasing t doesn't imply constant velocity within a segment between two points. Seems like a more complex approach will be necessary
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.
