Camera rework

@kadst43 @eric79 

This should be finished, pending the review. This runs off of `vwf/mars-game-staging` and does not use the navigable changes I was attempting to make. It's similar to the `targetFollower/camera` model, but with the camera mount system we talked about.

I rewrote the camera pan functionality using the new system and I changed the delay from 17 seconds to 3 seconds (this can be tweaked). I know the delay is supposed to sync up with the VO, but it doesn't really and it's too long so when it pans after 17 seconds it feels like a bug. I think the user gets the point if the camera shows them the radio and then the VO tells them to travel to it.

I also rewrote the navigation modes so that we aren't messing with the `matrixWorld` directly.
If it stays at 17, then we need to take control of the camera during that 17 seconds. Moving the camera around and having it suddenly launch itself across the map feels like a bug.