MSCO 2.10.1: car doors and garage door synced, door lock fix, perf tools

- Car doors (FSM with bool "Open" and "Open door"/"Close door") are synced as open/closed:
  the receiver removes the hold joint and frees the hinge, closing runs the game's own logic
- Fix: every synced close of an already closed Satsuma door added another FixedJoint, so the
  door could not be opened anymore; extra joints are removed automatically
- Hinge sync also covers world doors/gates with hinges (garage door), interaction by bounds
- Scene name read once per frame (Application.loadedLevelName allocates a string per call)
- Console "perf" (FPS, ms per MSCO part incl. OnGUI, GC, hook calls), -msco-perf start option
- Console "fsmdump <text>" / -msco-dump: PlayMaker FSMs and hinges to MSCO\fsmdump.txt

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

MenuHelper.cs

@@ -11,8 +11,32 @@ namespace MSCO
         public const string MenuScene = "MainMenu";
         public const string GameScene = "GAME";
 
-        public static bool InMenu { get { return Application.loadedLevelName == MenuScene; } }
-        public static bool InGame { get { return Application.loadedLevelName == GameScene; } }
+        public static bool InMenu { get { return Scene == MenuScene; } }
+        public static bool InGame { get { return Scene == GameScene; } }
+
+        static string scene;
+        static int sceneFrame = -1;
+
+        /// <summary>
+        /// Aktuelle Szene, einmal pro Bild gelesen: Application.loadedLevelName erzeugt bei jedem Aufruf einen neuen String
+        /// (Müll für den Garbage Collector), und InGame/InMenu werden pro Bild sehr oft abgefragt.
+        /// </summary>
+        public static string Scene
+        {
+            get
+            {
+                int frame = Time.frameCount;
+                if (frame != sceneFrame || scene == null)
+                {
+                    sceneFrame = frame;
+                    scene = Application.loadedLevelName;
+                }
+                return scene;
+            }
+        }
+
+        /// <summary>Nach einem Szenenwechsel (OnLevelWasLoaded) neu lesen.</summary>
+        public static void SceneChanged() { scene = null; }
 
         static readonly MethodInfo switchState =
             typeof(Fsm).GetMethod("SwitchState", BindingFlags.NonPublic | BindingFlags.Instance);