Config: add debug flag

Elwig/Windows/MainWindow.xaml.cs

@@ -5,6 +5,10 @@ namespace Elwig.Windows {
 
         public MainWindow() {
             InitializeComponent();
+            if (!App.Config.Debug) {
+                TestWindowButton.Visibility = Visibility.Hidden;
+                //QueryWindowButton.Visibility = Visibility.Hidden;
+            }
         }
 
         private void Window_Loaded(object sender, RoutedEventArgs evt) { }