Automatic merge of T1.5.1-925-g1c557094e and 16 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 3ca0eb1: Blueprint/train car operations UI window
- Pull request #885 at fb6b812: 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 #903 at 29f3d1a: Downloading route content (Github, zip)
- Pull request #912 at f7b85e4: New Triple Valve Features Vol. 2
- Pull request #919 at 26cc6a8: Added mouse wheel support for controls which can be moved by pressing t…
- Pull request #923 at cc1b5b6: Add curve squeal to route
- Pull request #924 at 6c2c3cd: Default Asset Improvements
- Pull request #925 at e3b1688: Fix brakeshoe force bug
- Pull request #927 at cf687d4: AI Train Power Supply/Lights Fix
- Pull request #929 at a406a69: Add support for common circuit breaker variants

Author: openrails-bot

Source/Menu/Notifications/NotificationManager.cs

@@ -101,6 +101,8 @@ private string GetRemoteJson()
             // Helpful to supply server with data for its log file.
             client.Headers[HttpRequestHeader.UserAgent] = $"{System.Windows.Forms.Application.ProductName}/{VersionInfo.VersionOrBuild}";
 
+            // Trial for glTD and PBR graphics
+            //return client.DownloadString(new Uri("https://wepp.co.uk/openrails/notifications/menu_testing_direct3d.json"));
             return client.DownloadString(new Uri("https://wepp.co.uk/openrails/notifications/menu.json"));
         }
 
@@ -241,7 +243,7 @@ private Check CheckExcludes(Check check)
             {
                 if (c is Contains)
                 {
-                    CheckContains(check, c);
+                    return CheckContains(check, c);
                 }
             }
             return null;
@@ -259,7 +261,7 @@ private Check CheckIncludes(Check check)
 
             foreach (var c in check.IncludesAnyOf)
             {
-                CheckContains(check, c);
+                return CheckContains(check, c);
             }
             return null;
         }