Add events for tracking rotation and exposing train id changes

[kirazy]

Adds four events:

• on_train_rotating
  • Raised when a train will actually rotate, prior to any rotation occurring. Raised for both rotate/unrotate actions.
• on_train_locomotive_rotated
  • Raised for each locomotive that is rotated, after the new train is created.
• on_train_rotated
  • Raised after all locomotives have rotated.
• on_train_unrotating
  • Raised prior to unrotating a train due to a change in train state. Notably, not raised prior to unrotating a train due to disabling Noxy in Map settings.

This sets up a generic way for mods to integrate compatibility with this mod, since the primary pain point is tracking train id changes and when rotations occur.

This is part of a related pull request to integrate compatibility with Project Cybersyn.

It's not rigorously tested...

[NoxyNixie]

Sorry for the late response. I'm not sure I can merge this as it is. There are too many things that bug me about this PR eventhough I'm okay with the goal of the PR.

• There are unnecessary whitespace changes.
• The triple dashed comments are very noisy (I know your tooling might need them but I don't so please remove those)
• Don't touch info.json I'll do that when I do the actual release.
• The file remote-interfaces.lua doesn't need to be in a subfolder.
• I have not touched the changelog for many versions, if you update that one you should include all other changes too or just don't update it.