Moved application code to the Application layer

Imported Win10 project
Code cleanup
WIP - Use common UWP services for Win8.1 and Win10

ModernKeePass10/Views/Old/SettingsPage.xaml.cs

@@ -0,0 +1,31 @@
+using Windows.UI.Xaml.Controls;
+using ModernKeePass.ViewModels;
+using ModernKeePass.ViewModels.ListItems;
+
+// The Split Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234234
+
+namespace ModernKeePass.Views
+{
+    /// <summary>
+    /// A page that displays a group title, a list of items within the group, and details for
+    /// the currently selected item.
+    /// </summary>
+    public sealed partial class SettingsPage
+    {
+        public new SettingsViewModel Model => (SettingsViewModel)DataContext;
+
+        public SettingsPage()
+        {
+            InitializeComponent();
+            ListView = MenuListView;
+            ListViewSource = MenuItemsSource;
+        }
+        
+        private new void ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            base.ListView_SelectionChanged(sender, e);
+            var selectedItem = Model.SelectedItem as ListMenuItemViewModel;
+            MenuFrame?.Navigate(selectedItem == null ? typeof(SettingsWelcomePage) : selectedItem.PageType);
+        }
+    }
+}