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>

ServerBrowser.cs

@@ -24,6 +24,8 @@ namespace MSCO
         public string Owner;                     // Besitzer des Lizenzschlüssels
         public bool Featured;                    // vom Keymaster-Admin hervorgehoben (steht in der Liste oben)
         public List<string> Tags = new List<string>(); // Admin-Tags (z.B. "official") und eigene Tags des Servers (Web-Panel)
+        public List<string> Mods = new List<string>(); // Mods des Servers ("Name Version") - bekommt man beim Beitreten
+        public bool Modded { get { return Mods.Count > 0 || Tags.Contains("modded"); } }
 
         public int UptimeSeconds = -1;
         public List<string> PlayerNames = new List<string>();
@@ -137,11 +139,28 @@ namespace MSCO
                     Owner = MiniJson.Str(o, "owner"),
                     Featured = MiniJson.Bool(o, "featured"),
                     Tags = MiniJson.Strings(o, "tags"),
+                    Mods = ModNames(o),
                 });
             }
             return list;
         }
 
+        static List<string> ModNames(Dictionary<string, object> o)
+        {
+            var names = new List<string>();
+            object v;
+            var list = o.TryGetValue("mods", out v) ? v as List<object> : null;
+            if (list == null) return names;
+            foreach (object item in list)
+            {
+                var m = item as Dictionary<string, object>;
+                if (m == null) continue;
+                string name = MiniJson.Str(m, "name", MiniJson.Str(m, "id", "?")), version = MiniJson.Str(m, "version", "");
+                names.Add(string.IsNullOrEmpty(version) ? name : name + " " + version);
+            }
+            return names;
+        }
+
         /// <summary>Server auf diesem PC suchen (127.0.0.1, übliche Ports); nur antwortende werden gezeigt.</summary>
         void ProbeLocalServers()
         {