Moved application code to the Application layer

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

ModernKeePass.ViewModelTest/AboutViewModelTests.cs

@@ -0,0 +1,17 @@
+using ModernKeePass.ViewModels;
+using NUnit.Framework;
+using Windows.ApplicationModel;
+
+namespace ModernKeePassApp.ViewModelTest
+{
+    [TestFixture]
+    public class AboutViewModelTests
+    {
+        [Test]
+        public void Should_Display_App_Version()
+        {
+            var aboutVm = new AboutViewModel(Package.Current);
+            Assert.AreEqual("1.0", aboutVm.Version);
+        }
+    }
+}