qt: daemon now operates in the background thread; added Quit GUI button

Daemon.cpp

@@ -265,5 +265,13 @@ namespace i2p
 
 			return true;
 		}
-	}
+
+        bool DaemonQT::init(int argc, char* argv[])
+        {
+        #if 0
+            m_Impl = std::make_shared<DaemonQTImpl> (argc, argv);
+        #endif
+            return Daemon_Singleton::init(argc, argv);
+        }
+    }
 }