cleanup, more docs, and multiple passengers #TrainsInMotion #Traincraft (1.7 rewrite)

- Removed some unnecessary variables.
- Cleaned up some functions.
- Added some missing documentation, and fixed some incorrect documentation.
- Added some of the groundwork for multiple passengers in rollingstock.

It was a busy day so I didn't accomplish much, tomorrow I should be able to finish multiple passengers and get onto tickets and maybe even other rollingstock.

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