Debugger now listens for connections and will only allow one at a time.

src/xenia/debug/protocols/ws/ws_protocol.h

@@ -33,10 +33,18 @@ public:
   virtual int Setup();
   virtual int WaitForClient();
 
+private:
+  static void StartCallback(void* param);
+  void AcceptThread();
+
 protected:
   uint32_t port_;
 
   socket_t socket_id_;
+
+  xe_thread_ref thread_;
+  bool          running_;
+  HANDLE        accepted_event_;
 };