Train Network Optimisations

This mod improves the performance of train network construction by preventing the connection of tracks that are
outside of loaded chunks.

Originally made for DeceasedCraft by request of TqLxQuanZ but can be used as a standalone.

The main upside of this is that it allows for much larger train networks to be built and allows train networks
to be created by worldgen without causing massive lag spikes as the game tries to connect tracks that are outside of
the loaded area.