Transfer existing features to lua where possible

[Moneyl]

Things like the free cam and the first person cam should be transferred to lua for the same reasons listed in #8 for moving gui code to lua. It might be better to move these into another repo that is included by automated builds to keep this one from growing too large.

CameraWrapper would still be written in c++ and bound to lua to provide a nice way of controlling the camera, but the actual camera logic would be in lua.