Automatic merge of T1.5-rc1-80-gf4212d3c4 and 12 pull requests

- Pull request #570 at 824f96f: Experimental glTF 2.0 support with PBR lighting
- Pull request #630 at 704731a: Sky Color Fix (Addresses Trello Roadmap Card #367 for More accurate sunrise and sunset)
- Pull request #652 at 918fdb1: Add button functions to Raildriver
- Pull request #677 at c1c417f: Correct double heading bug
- Pull request #692 at 20de7da: Italian translation for OR 1.5
- Pull request #699 at 6baf43d: Bug fix for https://bugs.launchpad.net/or/+bug/1987453. Web: HUD/Force Information, some labels not visible.
- Pull request #706 at 265d33d: Extended door functionality
- Pull request #712 at 68cd8ab: Search for NORMAL signals if no argument is provided
- Pull request #713 at 6c8701f: https://blueprints.launchpad.net/or/+spec/cruise-control 
- Pull request #715 at 447143b: Bug fix for //bugs.launchpad.net/or/+bug/1990930 Default snow terrtex not appearing
- Pull request #722 at fb9079e: Fix Windows Forms deprecations in ActivityEditor
- Pull request #726 at d812554: Correctly initialize triple valve for EP trains

Source/Orts.Simulation/Simulation/RollingStocks/SubSystems/Brakes/MSTS/AirSinglePipe.cs

@@ -329,7 +329,7 @@ public override void Initialize(bool handbrakeOn, float maxPressurePSI, float fu
                 ControlResPressurePSI = maxPressurePSI;
             FullServPressurePSI = fullServPressurePSI;
             AutoCylPressurePSI = immediateRelease ? 0 : Math.Min((maxPressurePSI - BrakeLine1PressurePSI) * AuxCylVolumeRatio, MaxCylPressurePSI);
-            AuxResPressurePSI = TwoPipes ? maxPressurePSI : Math.Max(maxPressurePSI - AutoCylPressurePSI / AuxCylVolumeRatio, BrakeLine1PressurePSI);
+            AuxResPressurePSI = Math.Max(TwoPipes ? maxPressurePSI : maxPressurePSI - AutoCylPressurePSI / AuxCylVolumeRatio, BrakeLine1PressurePSI);
             if ((Car as MSTSWagon).EmergencyReservoirPresent)
                 EmergResPressurePSI = Math.Max(AuxResPressurePSI, maxPressurePSI);
             TripleValveState = AutoCylPressurePSI < 1 ? ValveState.Release : ValveState.Lap;