Moved application code to the Application layer

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

ModernKeePass10/Views/MainPageFrames/WelcomePage.xaml.cs

@@ -0,0 +1,15 @@
+// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace ModernKeePass.Views
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class WelcomePage
+    {
+        public WelcomePage()
+        {
+            InitializeComponent();
+        }
+    }
+}