Automatic merge of T1.5.1-495-g55f992dcd and 10 pull requests

- Pull request #570 at 7269d24: Experimental glTF 2.0 support with PBR lighting
- Pull request #757 at d9d75f4: Unify RailDriver code implementations
- Pull request #799 at dc03850: Consolidated wind simulation
- Pull request #821 at cc3af66: Adds suppression of safety valves
- Pull request #829 at 434af02: Improvements for air brakes #3 - Emergency valves
- Pull request #831 at 9417e1b: poor mans switch panel on tablet
- Pull request #839 at d00beb9: First phase of https://blueprints.launchpad.net/or/+spec/additional-cruise-control-parameters
- Pull request #846 at 98f1c45: Initialize cars before restore
- Pull request #849 at 0d4e3da: Contributed projects and forking clarity
- Pull request #850 at 1605667: Correct output of sound system info

Source/Orts.Simulation/Simulation/RollingStocks/MSTSControlTrailerCar.cs

@@ -128,6 +128,7 @@ public override void Copy(MSTSWagon copy)
         /// </summary>
         public override void Save(BinaryWriter outf)
         {
+            base.Save(outf);
             ControllerFactory.Save(GearBoxController, outf);
             outf.Write(ControlGearIndication);
             outf.Write(ControlGearIndex);