Create a new interface for Studious Controllers

# Context

We need a common interface for controllers to better take advantage of polymorphism. Right now we're just explicitly interacting with our controllers (AnimationController, PhysicsController, etc) when we could be creating a list of "StudiousControllers" that all share a common interface. Some methods and variables I am thinking all these controllers would share:

* addSceneObject()
* removeSceneObject()
* init()
* update()
* shutdown()
* int shutdown_

There may be more, but that's just a start.