Camera Toggling and Exit Script

Finished camera-switching script and camera presets.
- After adding Camera.prefab to the scene, you have to assign the Target
variable for each camera to a Vector, usually the train's Center of
Mass.
- Hit 'C' to swap cameras.
- TODO : Make all cameras get 'Target' from parent so that it is easier
to setup.

Exit Script
- Attach to anything, probably 'The Game', hit ESC and it quits the
game.