This allows new calls entered while the car is moving to be serviced before the original destination, provided they are in the correct direction, will be reached before the original destination, and the car can stop soon enough.
This includes:
* Controller (runs and responds to calls placed on the screen, parameter editing and switches work)
* Null Drive (simulates motion so the controller can run, no actual movement yet)
* Call Buttons (lights can be toggled with right-click, no communication yet)
