Patch notes for v0.8.4a

Cargo depot and station modules now show input/output products, and the product search now includes trains. * Reintroduced network train timeout based on transfer inactivity rather than total time at station, with a notification when a train is forced to depart. * Terrain inspector tool no longer rounds tile sizes. * Fixed terrain physics stopping on tiles touched by a recovery save load. * Fixed terrain physics and disruption not fully recovering after loading a recovery save. * Fixed config references becoming stale after save/load, which could cause difficulty changes or mod overrides to apply to outdated copies. * Fixed stacker tower premature warnings. * Fixed that ramps could be built perpendicular to start ports when port avoidance was enabled, preventing the port from being used. * Fixed balancing between flipped train stations. * Fixed unstable pipe start direction when the first segment would be vertical. * Fixed terrain inspector not showing layers below intermediate bedrock. * Fixed an error when trains pulled away from a station that required reserving critical sections at the nose. * Fixed "cannot path" notification briefly appearing at turn-around stations. * Fixed errors and incomplete loads caused by orphaned train track pillars/poles. * Fixed tenders not functioning correctly when reversing. * Fixed cancel job tooltip showing stale product from previous train. * Fixed a memory leak that prevented the game from releasing memory after returning to the main menu.