Revert "Tracking of Player kart on the quad graph."

This reverts commit 10a124825cd480f414662167d06f5e5e0833afc3.
Revert "New function in AIBaseController and PlayerController(previous commit) that returns the normal of the current quad."

This reverts commit 2e27e0065d01e46c864a84e2acf663716e92b238.
Using quad normals to find material and set gravity. (not yet functional)