MSCO 2.10.0: mod support, ESC no longer quits from the main menu

- MscoMod API (ModApi.cs) and ModLoader: own mods from MSCO\Mods, hooks for menu/game/update/GUI,
  session and player events, Send/OnMessage between players (MsgType.ModMessage)
- Server mods: ModList before Welcome, consent prompt (INSTALL & JOIN), download with SHA-256 check
  into MSCO\Mods\Servers, active only on that server; game start waits for the download
- Mods page in the MSCO menu, console command "mods"
- Server browser: MODS pill, VANILLA/MODDED filters, mod list in the server profile
- PlayMaker ApplicationQuit is ignored in the main menu (ESC used to close the game)
- MODDING.md and examples/HelloMod

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

Bootstrap.cs

@@ -64,6 +64,7 @@ namespace MSCO
             try
             {
                 string name = new AssemblyName(args.Name).Name;
+                if (name == typeof(Bootstrap).Assembly.GetName().Name) return typeof(Bootstrap).Assembly; // Mods verweisen auf MSCO
                 string file = Path.Combine(folder, name + ".dll");
                 if (File.Exists(file)) return Assembly.LoadFrom(file);
             }
@@ -141,6 +142,23 @@ namespace MSCO
                 return;
             }
             MultiplayerManager.Ensure();
+            SceneChanged(scene);
+        }
+
+        /// <summary>Mods: beim ersten Hauptmenü laden, dann Menü/Spiel melden.</summary>
+        static void SceneChanged(string scene)
+        {
+            if (scene == "MainMenu")
+            {
+                ModLoader.LoadLocal();
+                ModLoader.MenuLoad();
+            }
+            else if (scene == "GAME") ModLoader.GameLoad();
+        }
+
+        void FixedUpdate()
+        {
+            ModLoader.FixedUpdate();
         }
 
         bool skipping, loadingScreen;
@@ -150,6 +168,7 @@ namespace MSCO
 
         void Update()
         {
+            ModLoader.Update();
             if (!skipping || Time.frameCount < skipFrame + 2) return;
             skipping = false;
             loadingScreen = true;
@@ -158,7 +177,11 @@ namespace MSCO
 
         void OnGUI()
         {
-            if (!skipping && !loadingScreen) return;
+            if (!skipping && !loadingScreen)
+            {
+                ModLoader.OnGUI();
+                return;
+            }
             GUI.depth = -10000;
             if (black == null)
             {
@@ -183,6 +206,7 @@ namespace MSCO
             MenuBranding.ApplyWindow();
             if (Application.loadedLevelName == "MainMenu") StartCoroutine(BrandMenu());
             MultiplayerManager.Ensure();
+            SceneChanged(Application.loadedLevelName);
         }
 
         /// <summary>Logo im Hauptmenü ersetzen - ein paar Mal, falls das Menü es erst nach dem Laden zeigt.</summary>