Remove wrappers that are outside the scope of this project.
5.1.0
Support for 2 controllers (still needs work to be officially supported). The feature results in faster access to controller state buffers from python, so should be slightly faster as well.
5.0.2
fully reviewed code and resolved most of the bad smells
5.0.1
make `_skip` property public (i.e., `skip`) so it's more intuitive that this value may be mutated by end-users.
5.0.0
Move frame skip to a separate env wrapper and remove the frame limiting mechanism
4.1.2
Set a flag when a backup is created so that `reset` can know to use `_backup` instead of `_LIB.reset(self._env)`