Switch to react-three-fiber

[Abbondanzo]

If we use react-three-fiber, we can eliminate several of the model loaders and managers to localize them into a single React component. This also lets us lock down certain behaviors, like attaching the camera (by passing it as a prop) amongst other cool state-based functionality that plain ol' classes do not give us.

[Abbondanzo]

Did a bit of poking and it seems like we're going to need to do some additional setup. Going to kick this down the line until alpha is released so that we can lock down control functionality first.

[Abbondanzo]

Closing this since it doesn't make much sense to lock us down into React