Train personalization; names and auto colour

[MegaMech]

What:
Train names and preset locomotive placement colour.


Why:
In big servers it's difficult to find your train in the train list. Add train names like in train stops.
Then when you hit the train button you can see all the names and just know which one is yours. Perhaps pregenerated names could use like "CN 113."
The UI that pops up when you click "Trains" is kind of empty anyway and you can only differ between trains by looking at the maps.

Thanks