Unlock 3rd person camera

[danielbrownmsm]

The 3rd person camera for the robot points forwards, which is great, unless you're moving one of the other 3 directions. the camera should either move automatically to point in the direction you're going, or be controlled by the mouse, or something like that. it doesn't have to be pretty, it just needs to work.

• add a mouse-controlled camera (like Scrap Mechanic follow cam)
• add a camera that follows the direction you're going (kinda like that one Trailmakers camera)
• keep the current fixed camera as an option too
• add a main menu option for which one is default
• add a way to swap between views on the pause menu
• add a birds eye view camera
• add a keybind to go between all the camera views

[danielbrownmsm]

A birds eye of the whole course would be pretty sick too, see #12