Automatic merge of T1.5.1-1848-g58ff988ed and 13 pull requests

- Pull request #570 at 362e4e7: glTF 2.0 support with PBR lighting
- Pull request #1062 at 9a76b26: Train Forces popup Window.
- Pull request #1064 at 1be1fc4: Add Train Info tab to Help window (F1)
- Pull request #1085 at 37e2817: updates key commands for Train Operations window and also Daylight Offset
- Pull request #1086 at e10390b: Add Settings Exporter tool (copy settings to INI, etc)
- Pull request #1087 at 1f64f02: Improve warning message for signal location mismatch.
- Pull request #1088 at 4b3fa4c: Preserve previous log file.
- Pull request #1089 at d750bd1: Fix Superelevation on Rigid Frame Rolling Stock Again
- Pull request #1090 at 9e0bfe8: Add null check to avoid crash on corrupt signal files
- Pull request #1092 at d5816e4: Adds $gradient, $req, depart-early and passing-time to Manual
- Pull request #1082 at 5845a1a: Allow variable water level in glass gauge
- Pull request #1081 at 689494b: Brake cuts power unification
- Pull request #1091 at b0c622b: Automatic speed control

Author: openrails-bot

Source/Orts.Simulation/Simulation/RollingStocks/SubSystems/TrainControlSystem.cs

@@ -673,7 +673,7 @@ SignalFeatures NextGenericSignalFeatures(string signalFunctionTypeName, int item
                     foreach (var head in trainSignal.SignalObject.SignalHeads)
                         if (head.Function == function)
                             functionHead = head;
-                    if (functionHead != null)
+                    if (functionHead == null)
                         goto Exit;
                     signalTypeName = functionHead.SignalTypeName;
                     if (functionHead?.signalType?.DrawStates != null)