Separated Classes and moved entity physics models to client and server

- Added PlayerControlBehavior to manage user actions for a player
- Added SceneGenerator class to build the scenes
- Separated server connection in the client
- Fuel: Moved physics model to client and server
- Moved getRandomPad to MapGenerator class
- Player: Moved physics model to client and server
- Player: Stop spamming thrust stop messages
- Wall: Moved physics model to client and server
- Initialize fuel bar to be full when connecting