Automatic merge of T1.5.1-351-gc9abcd22b and 8 pull requests

- Pull request #570 at de7a14f: Experimental glTF 2.0 support with PBR lighting
- Pull request #732 at 1edb2e5: Improvements for air brakes
- Pull request #751 at 00981a2: Web interface to control cab controls with external hardware
- Pull request #767 at 82c5f1c: Refine sunrise and sunset
- Pull request #799 at eb92d81: Consolidated wind simulation
- Pull request #803 at 7157e08: Various adjustments to steam adhesion
- Pull request #809 at f67822a: Some on-screen messages not suppressed, Bug #2008012
- Pull request #813 at 80789c6: Refactored garbage generators

Author: openrails-bot

Source/Orts.Formats.Msts/SignalConfigurationFile.cs

@@ -44,7 +44,7 @@ public class SignalConfigurationFile
         /// <summary>Name-indexed list of available signal functions</summary>
         public IDictionary<string, SignalFunction> SignalFunctions;
         /// <summary>Allocation-free MstsName-indexed list of available signal functions</summary>
-        public static IDictionary<MstsSignalFunction, SignalFunction> MstsSignalFunctions;
+        public static Dictionary<MstsSignalFunction, SignalFunction> MstsSignalFunctions;
         /// <summary>List of OR defined subtypes for Norman signals</summary>
         public IList<string> ORTSNormalSubtypes;
         /// <summary>Name-indexed list of available light textures</summary>
@@ -83,7 +83,7 @@ public SignalConfigurationFile(string filenamewithpath, bool ORTSMode)
             };
 
             // and the allocation-free version of the above 
-            MstsSignalFunctions = new SortedDictionary<MstsSignalFunction, SignalFunction>
+            MstsSignalFunctions = new Dictionary<MstsSignalFunction, SignalFunction>
             {
                 { MstsSignalFunction.NORMAL, SignalFunction.NORMAL },
                 { MstsSignalFunction.DISTANCE, SignalFunction.DISTANCE },