Small patch to fix various problems — Diesel Railcar Simulator Steam update #485213

A small patch has been released with the following important fixes: Fixed gearbox sound system to make it possible to add gearbox sounds in the train editor Improved AI braking behaviour to take track gradient into account when computing braking target speeds Improved Class 03/37/brake van brake performance and adjusted volumes Fixed various LOD problems in vehicle bodies Fixed pathfinding bug causing the sim to crawl to a halt on Frisia Western Lines map Fixed crash when adding a custom scenery model template without name and then trying to add it Fixed custom scenery models getting mixed with built-in ones Runs saved with the earlier version are incompatible with this one, so you may get an "error loading saved run" message when trying to continue your last run.