Non-blocking bus stops
A bus will not enter the bus stop until the previous one leaves it completely.
This may create a traffic jam when the road is used by other vehicles even if you have only 2 busses using this stop.
The mod adds a non-blocking flag to the bus stops.
Now the new bus will enter the stop at the moment when the previous starts leaving, essentially doubling the throughput.
This may cause clipping when the new bus enters the area with high speed while the previous one just started moving, but this is a rare case.
