Automatic merge of T1.5.1-797-gabb8eb9a4 and 13 pull requests

- Pull request #570 at 3539862: Experimental glTF 2.0 support with PBR lighting
- Pull request #839 at d00beb9: First phase of https://blueprints.launchpad.net/or/+spec/additional-cruise-control-parameters
- Pull request #876 at f92de76: docs: add source for documents previously on website to source Documentation folder
- Pull request #882 at a055bca: Blueprint/train car operations UI window
- Pull request #885 at 8f94333: feat: Add notifications to Menu
- Pull request #886 at 6c0785b: Scene viewer extension to TrackViewer
- Pull request #892 at 1f5ba4c: Signal Function OPP_SIG_ID_TRAINPATH
- Pull request #896 at 5866028: First implementation of https://blueprints.launchpad.net/or/+spec/specific-sounds-for-ai-trains
- Pull request #897 at 0a9d939: feat: Improved system information collection
- Pull request #899 at d33a9f6: Duplex steam engines - Booster Engine addition
- Pull request #907 at 9b0b04f: Bug fix for https://bugs.launchpad.net/or/+bug/2047300 Dynamic tracks disappear after long tunnel
- Pull request #908 at 4b4afe3: feat: supports switching adhesion precisions
- Pull request #909 at c3a572a: Correct Control Car crash bug

Author: openrails-bot

Source/Orts.Simulation/Simulation/RollingStocks/MSTSSteamLocomotive.cs

@@ -5588,7 +5588,7 @@ private void UpdateSteamTractiveForce(float elapsedClockSeconds, float locomotiv
             // only set advanced wheel slip when advanced adhesion, and simplecontrols/physics is not set and is in the the player train, AI locomotive will not work to this model. 
             // Don't use slip model when train is in auto pilot
             {
-                if (SteamEngineType != SteamEngineTypes.Geared || SteamEngines[numberofengine].AuxiliarySteamEngineType != SteamEngine.AuxiliarySteamEngineTypes.Booster)
+                if ((SteamEngineType == SteamEngineTypes.Compound || SteamEngineType == SteamEngineTypes.Simple) && SteamEngines[numberofengine].AuxiliarySteamEngineType != SteamEngine.AuxiliarySteamEngineTypes.Booster)
                 {
 
                     float slipCutoffPressureAtmPSI;
@@ -5901,7 +5901,7 @@ private void UpdateSteamTractiveForce(float elapsedClockSeconds, float locomotiv
 
                     if (SteamEngines[numberofengine].AuxiliarySteamEngineType == SteamEngine.AuxiliarySteamEngineTypes.Booster)
                     {
-                        GearRatioAdjusted = SteamEngines[numberofengine].BoosterCutoff;
+                        GearRatioAdjusted = SteamEngines[numberofengine].BoosterGearRatio;
                     }
                     else
                     {