Automatic merge of T1.5.1-376-g885592329 and 12 pull requests

- Pull request #570 at de7a14f: Experimental glTF 2.0 support with PBR lighting
- Pull request #732 at 36b4b6d: Improvements for air brakes
- Pull request #751 at 00981a2: Web interface to control cab controls with external hardware
- Pull request #799 at dc03850: Consolidated wind simulation
- Pull request #802 at 4d198e4: Added support for activity location events to the TrackViewer
- Pull request #803 at 7157e08: Various adjustments to steam adhesion
- Pull request #813 at ff454eb: Refactored garbage generators
- Pull request #815 at a5cc165: chore: Add GitHub automatic release notes configuration
- Pull request #818 at 745d101: Allow independent drive axles for locomotives
- Pull request #820 at 6e7a5b6: delay option for masterkey does not delay switch off
- Pull request #821 at e0fa5a8: Adds suppression of safety valves
- Pull request #822 at 82ef736: battery switch two buttons option in combination with a delay

Source/Orts.Simulation/Simulation/RollingStocks/MSTSLocomotive.cs

@@ -2801,17 +2801,9 @@ public virtual void AdvancedAdhesion(float elapsedClockSeconds)
             // This enables steam locomotives to have different speeds for driven and non-driven wheels.
             if (EngineType == EngineTypes.Steam && SteamEngineType != MSTSSteamLocomotive.SteamEngineTypes.Geared)
             {
-                if (AbsSpeedMpS <= 0.15 && !WheelSlip)
-                {
-                    WheelSpeedSlipMpS = SpeedMpS;
-                    WheelSpeedMpS = SpeedMpS;
-                }
-                else
-                {
-                    WheelSpeedSlipMpS = LocomotiveAxles[0].AxleSpeedMpS;
+                WheelSpeedSlipMpS = LocomotiveAxles[0].AxleSpeedMpS;
                     WheelSpeedMpS = SpeedMpS;
                 }
-            }
             else WheelSpeedMpS = LocomotiveAxles[0].AxleSpeedMpS; 
 
         }