Timetable editor improvement update — Diesel Railcar Simulator Steam update #485204

Improvements to the timetable editor The editor now has a separate concept of formations that can be shared between different templates. There's a "formations" button at the top of the side panel for editing the formations. "Service vehicles" are now bound to a formation instead of a template, and templates have a drop-down menu for choosing the formation. Old timetables will have formations auto-generated for each template. Similar formations are not automatically merged and shared between templates, but you can do so manually. Each formation has a default train length that can be overridden in each of the templates. The default length can also be overridden in each of the services. Vehicles belonging to a formation can now be marked as "variable". This means that when the train length is longer than the list of vehicles defined in the formation, the system will primarly repeat the vari...