Add config file

Elwig/Windows/MainWindow.xaml.cs

@@ -19,7 +19,6 @@ namespace Elwig.Windows {
         }
 
         private void Window_Loaded(object sender, RoutedEventArgs evt) {
-            Context.Countries.Load();
             Button4.IsEnabled = App.IsPrintingReady;
         }
 

Elwig/Windows/MemberAdminWindow.xaml.cs

@@ -1,5 +1,4 @@
 using Microsoft.EntityFrameworkCore;
-using ModernWpf.Controls;
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;