Editor maintenance update — Diesel Railcar Simulator Steam update #485209

This update fixes several crashes in all editors and has various improvements to how the editor side panel works. Cloning now works more reliably in the train editor and has also been added to the timetable editor (templates, services, vehicles). Clones can also be done by right-clicking an item at the top of the side panel in addition to the button at the bottom. Other editor fixes Fixed "append/insert nodes" mode to complete by right-clicking like the other track laying modes Fixed "add new template" mode in timetable editor to accept a single-order template Fixed missing models from the list of built-in models Fixed train editor not showing changes after saving as new and using undo (and possibly saving over the old one) Fixed 2D/3D button in route editor to not mess up the camera Changed node material matching name to ignore whitespace Traffic and AI Fixed pathfinder and signaller AI...