Automatic merge of T1.4-84-g4dced6b1d and 10 pull requests

- Pull request #525 at b5ac1d2: Add SignalTypeName and DrawStateName to SignalFeatures
- Pull request #527 at 27f05a1: Brake cuts power refactor and new parameters
- Pull request #531 at b2affac: Bug fix for https://bugs.launchpad.net/or/+bug/1950578 Dyn Brake setup state not disappearing in cab
- Pull request #533 at 62a1c27: fix for shapes hidden by animations( 0 )
- Pull request #537 at e753905: C# signal script extensions
- Pull request #538 at c457f11: Delete binary paths if the ascii version or the tdb was modified. Blueprint: https://blueprints.launchpad.net/or/+spec/binary-timetable-paths
- Pull request #542 at 83320ed: adds new webpage, moves Testing out of Download/Programs
- Pull request #543 at 5b0121c: adds Discover > Roadmap webpage
- Pull request #544 at 8117250: Blueprint https://blueprints.launchpad.net/or/+spec/cabview-controls-for-generic-items
- Pull request #545 at 265b635: Fix VRAM usage

Source/RunActivity/Viewer3D/Materials.cs

@@ -212,7 +212,10 @@ public void Mark(Texture2D texture)
         public void Sweep()
         {
             foreach (var path in TextureMarks.Where(kvp => !kvp.Value).Select(kvp => kvp.Key))
+            {
+                Textures[path].Dispose();
                 Textures.Remove(path);
+            }
         }
 
         [CallOnThread("Updater")]

Source/RunActivity/Viewer3D/RollingStock/MSTSLocomotiveViewer.cs

@@ -354,8 +354,10 @@ internal override void Mark()
             foreach (var pdl in ParticleDrawers.Values)
                 foreach (var pd in pdl)
                     pd.Mark();
-            if (_CabRenderer != null)
-                _CabRenderer.Mark();
+
+            _CabRenderer?.Mark();
+            ThreeDimentionCabViewer?.Mark();
+
             base.Mark();
         }
 
@@ -2927,9 +2929,13 @@ public override void PrepareFrame(RenderFrame frame, ElapsedTime elapsedTime)
 
         internal override void Mark()
         {
-            // TODO: This is likely wrong; we should mark textures, shapes and other graphical resources here.
+            TrainCarShape?.Mark();
+            foreach (ThreeDimCabDigit threeDimCabDigit in DigitParts3D.Values)
+            {
+                threeDimCabDigit.Mark();
+            }
         }
-    } // Class ThreeDimentionCabViewer
+    }
 
     public class ThreeDimCabDigit
     {