Added more tests

Code cleanup in Lib
WIP new VM for OpendatabaseControl
WIP KDBX4 file save - still not working

ModernKeePass/Controls/OpenDatabaseUserControl.xaml.cs

@@ -5,6 +5,7 @@ using Windows.UI.Xaml;
 using Windows.UI.Xaml.Input;
 using ModernKeePass.Common;
 using ModernKeePass.Events;
+using ModernKeePassLib.Cryptography;
 
 // Pour en savoir plus sur le modèle d'élément Contrôle utilisateur, consultez la page http://go.microsoft.com/fwlink/?LinkId=234236
 
@@ -35,7 +36,7 @@ namespace ModernKeePass.Controls
                 typeof(string),
                 typeof(OpenDatabaseUserControl),
                 new PropertyMetadata(string.Empty, (o, args) => { }));
-
+        
         public OpenDatabaseUserControl()
         {
             InitializeComponent();