Small Update 2

-- Changed the camera to follow on fixedupdate, this removes jittery camera following

-- Added 2 new planets to the spawner

-- Changed all sprites to diffuse sprites, allowing for lighting

-- Added lights to the ships' engines and one of the planets

TODO:

- Add celestial body simulation

- Add interaction with planets

- Maybe add a cargo (gotta think about what I really want to do with this)