Extend to buses about bettertrainboarding

[Vectorial1024]

Observation of the bendy buses:

https://youtu.be/Z6Nf5O0DQf0?t=2955

Conclusion: yeah they have their trailers, but fundamentally, they are still using the same idea of having only 1 pax-carrying section, so there is no need to extend Better Train Boarding to buses.

Therefore, closing this.

[Vectorial1024]

Nope. Hold on a minute.

Somewhere during development, I added extra code to make it such that passengers who arrived first will get on the vehicle first.

This can be very useful to deal with busses. It is not just the "get them into the best car" problem, but the "respect the queue" problem.

Therefore, can reconsider this.

[Vectorial1024]

This is now fixed and released.

On this note, I noticed I made a mistake in the boarding order in the previous version(s). I intended to make it "first come first served", but I coded it as "first come last served", which makes things confusing. For some reason I did not notice this for the good part of the year... But still, this is now also fixed.