Fixed some RouteFind debug logging.
Locked out track resets from allowing RouteFind to prevent IndexOutOfRange crash due to clearing the lists while a cart is trying to pathfind.

Added cart tier filtering that allows no ore freighters.
Improved cleanup of freight interface registrations on deleting the machine or the station connected.
Carts now correctly check their assigned station for delivery as priority over others. This should make carts at requesting stations more consistently deliver the goods they collect to their assigned station.
Breaking a station will not automatically clear closest junction connections so manual reset is not necessary.

Properly handle null/empty strings for station stats network syncing.

Corrected RouteFind to pull the distance from the source node track segments and added a null check to prevent crashes.

System monitor window explicitly resets scroll position on opening the window.
Carts now check for multiple segments between junctions and are sure to take the shorter path.
Paths with freight stations are now penalized 5 meters per station. This should help encourage carts to stay on the main line if paths don't contain their destination.
Paths with booster rail have a bonus which encourages carts to take them for speed.

Some locking on TrackNetwork TrackJunctions to limit threading clashes.
Station hopper interfaces properly null out when the hopper is deleted.

Cut down on some log spam.
Added junction coordinates for route find failures.

Added upcraft recipe for scrap track to regular track to eliminate waste.
Moved cart filter label to new line in the UI to give it room for the full cart name.
Upgraded the freight system interface to provide the freight data for the connected stations network.

Fixed hopper station navigation not correctly checking for matching network ID.
Fully network sync'd the freight system monitor track systems display. All info in the display should exactly match what the server sees regardless of distance from the system or order of generation. This should help network clients debug freight issues.

Odd NRE catch on ToString for debugging.