fix: Log warning for any non-ACE/DDS textures in content

Author: twpol

Source/RunActivity/Viewer3D/Materials.cs

@@ -145,7 +145,10 @@ Texture2D invalid()
                         }
                     }
                     else
+                    {
+                        Trace.TraceWarning("Unsupported texture format: {0}", path);
                         return defaultTexture;
+                    }
 
                     Textures.Add(path, texture);
                     return texture;