Automatic merge of T1.5.1-722-g01614a154 and 18 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 #865 at 3b5a2fe: Dispatcher window improvements
- Pull request #874 at f8dbeab: Dynamic brake controller refactoring
- Pull request #875 at 43bf33e: Bug fix for https://bugs.launchpad.net/or/+bug/2036346 Player train switching doesn't work with 3D cabs
- Pull request #876 at f92de76: docs: add source for documents previously on website to source Documentation folder
- Pull request #882 at 481ed9d: Blueprint/train car operations UI window
- Pull request #885 at c81447b: feat: Add notifications to Menu
- Pull request #886 at 697a4b6: Scene viewer extension to TrackViewer
- Pull request #888 at d7daf62: docs: Document player application model
- Pull request #890 at 39a9fa4: Allow depart early
- Pull request #892 at 1f5ba4c: Signal Function OPP_SIG_ID_TRAINPATH
- Pull request #893 at bf8876b: Signal errors
- Pull request #894 at 794fddf: Correct Decrease Colour
- 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 #898 at e271395: Extra line with all the arguments for debugging purposes in logfile
- Pull request #900 at 42ea7ad: DMI updates

Author: openrails-bot

Source/RunActivity/Viewer3D/RenderFrame.cs

@@ -540,9 +540,9 @@ public void Clear()
             NumLights = 0;
         }
 
-        bool lastLightState;
-        double fadeStartTimer;
-        float fadeDuration = -1;
+        static bool lastLightState;
+        static double fadeStartTimer;
+        static float fadeDuration = -1;
 
         public void PrepareFrame(Viewer viewer)
         {
@@ -589,11 +589,6 @@ public void PrepareFrame(Viewer viewer)
                     }
                     lastLightState = lightState;
                 }
-                else
-                {
-                    fadeStartTimer = 0;
-                    fadeDuration = 0;
-                }
                 if (SolarDirection.Y <= -0.05)
                 {
                     clampValue = 1; // at nighttime max headlight