QmlEngine: Connect to port for remote setup

In the case of remote setup, the application output
may take a while. The timeout is increased to 60s.
Additionally in the case of mixed debugging, we check
the state of the master engine to determine if we should
keep waiting for the application output.

Change-Id: I237a3501c1e70dbe62870929e50f12ede80e7c56
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>
Reviewed-by: Christian Kandeler <christian.kandeler@nokia.com>

src/plugins/debugger/qml/qmlengine.h

@@ -169,6 +169,7 @@ private:
     bool evaluateScriptExpression(const QString &expression);
 
     bool hasCapability(unsigned) const;
+    void quitDebugger();
 
 private:
     void closeConnection();