Personal Cars

Many improvements in the code, many bug/crashfixes. Removed R button for starting the engine (now you can start it using your car's key while sitting inside the car) and totally changed the way cars move. You have 2 modes right now. The default one is a simple-steer mode that instantly allows the car to reach it's maximum speed (it works kinda like horses or any other vehicles like them). The second mode (you can enable it via config) lets you speed up and slow down. The car gains and loses momentum while driving. This also allows you to drift using the handbrake (space bar). Have fun!