feat: remote control trains

[pernydev]

Description

This would be a massive deal and something that I understand takes a lot of time to make, but I think it would just be so useful. (or that's just me needing it for a project)

I'm imagining it could work by giving a train driver entity an ender modem and then that can be connected to as a peripheral. It could also be possible to identify what ender modem train is at a station via the station peripheral. When driving a train you should set a throttle and the train should go to that throttle. There should be events like "station approachable" for when the train is able to approach a station, you should then be able to approach that station.

[landynmj]

Also events at track junctions, and a way to label junctions with a tag, that way you can steer left or right via code.