Adds a new GUI for viewing how far each of your trains have traveled. 1 tile = 1 m!

Updated for 0.17!

Features:
- Adds a scrollable list of all trains and distances they've travelled.
- NEW: Clicking a train in the GUI opens up the Vanilla Train GUI interface.
- A free-text field allows filtering by the train-stop names in the train's schedule. E.g filtering with "copper" will filter to all trains that stop at a station with "copper" in the name. Handy to check just which Iron train is doing the most work!
- Train distance table can display train backer names or train IDs, toggleable in the mod settings. Other mods for modifying Backer names can be used to set up personalised names for your trains in the table.