Round out Controller trait functions

[cleak]

The Controller trait is missing some key functions from PxController and isn't very useful in its current state.

The functions appear to be exposed in physx-sys, so it's just a matter of properly piping them through. I'm happy to do this if there are no objections.

[cleak]

This has turned out to be considerably more complicated than I expected. The move function in particular references multiple data types which have nested pointers and inheritance based callbacks.