Listing account calendars on the shell, some visual state updates and reacting to calendar setting changes properly.

Wino.Calendar.ViewModels/Interfaces/IAccountCalendarStateService.cs

@@ -0,0 +1,10 @@
+using System.Collections.ObjectModel;
+using Wino.Calendar.ViewModels.Data;
+
+namespace Wino.Calendar.ViewModels.Interfaces
+{
+    public interface IAccountCalendarStateService
+    {
+        ObservableCollection<GroupedAccountCalendarViewModel> GroupedAccountCalendars { get; }
+    }
+}