Moved application code to the Application layer

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

ModernKeePass10/Actions/NavigateToUrlAction.cs

@@ -0,0 +1,33 @@
+using System;
+using Windows.UI.Xaml;
+using Microsoft.Xaml.Interactivity;
+using ModernKeePass.Common;
+
+namespace ModernKeePass.Actions
+{
+    public class NavigateToUrlAction : DependencyObject, IAction
+    {
+        public string Url
+        {
+            get => (string)GetValue(UrlProperty);
+            set => SetValue(UrlProperty, value);
+        }
+
+        public static readonly DependencyProperty UrlProperty =
+            DependencyProperty.Register("Url", typeof(string), typeof(NavigateToUrlAction), new PropertyMetadata(string.Empty));
+
+        public object Execute(object sender, object parameter)
+        {
+            try
+            {
+                var uri = new Uri(Url);
+                return Windows.System.Launcher.LaunchUriAsync(uri).GetAwaiter().GetResult();
+            }
+            catch (Exception ex)
+            {
+                MessageDialogHelper.ShowErrorDialog(ex).GetAwaiter();
+                return false;
+            }
+        }
+    }
+}