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

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

@@ -35,6 +35,7 @@ public:
   socket_t socket_id() const { return socket_id_; }
 
   virtual int Setup();
+  virtual void Close();
 
   void Write(uint8_t** buffers, size_t* lengths, size_t count);