Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Mail/Views/Abstract/PersonalizationPageAbstract.cs

@@ -1,10 +1,9 @@
-using Windows.UI.Xaml;
-using Wino.Mail.ViewModels;
+using Wino.Core.ViewModels;
 
 namespace Wino.Views.Abstract
 {
     public abstract class PersonalizationPageAbstract : SettingsPageBase<PersonalizationPageViewModel>
     {
-        
+
     }
 }