Moved application code to the Application layer

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

ModernKeePass10/ViewModels/AboutViewModel.cs

@@ -0,0 +1,27 @@
+using Windows.ApplicationModel;
+
+namespace ModernKeePass.ViewModels
+{
+    public class AboutViewModel
+    {
+        private readonly Package _package;
+
+        public string Name => _package.DisplayName;
+
+        public string Version
+        {
+            get
+            {
+                var version = _package.Id.Version;
+                return $"{version.Major}.{version.Minor}";
+            }
+        }
+
+        public AboutViewModel() : this(Package.Current) { }
+
+        public AboutViewModel(Package package)
+        {
+            _package = package;
+        }
+    }
+}