locig: refresh after edit project

* implemented saving project settings force-refreshes the project if something has changed.
* when nothing has changed while editing the project settings, the project is not refreshed anymore.
* new project window is cleared now before it is displayed.

src/lib_gui/qt/window/QtMainWindow.cpp

@@ -382,7 +382,7 @@ void QtMainWindow::openProject(const QString &path)
 
 	if (!fileName.isEmpty())
 	{
-		MessageLoadProject(fileName.toStdString()).dispatch();
+		MessageLoadProject(fileName.toStdString(), false).dispatch();
 		clearWindows();
 	}
 }