Add testing for vehicle controller

[tony56a]

We should have a way to verify the correctness of the vehicle controller itself, might involve:

• Separating vehicle controller code from any C:S specific components
• Implement a Unity version of C:S specific components (Vehicle/Building Meshs, environment, etc )
• Somehow integrate the controller into Unity's own Test framework
• Write some test cases ( instantiate vehicle, fake press some keys, observe vehicle state )