Implemented a new dialog for account re-ordering and required apis.

Wino.Mail/Selectors/AccountReorderTemplateSelector.cs

@@ -0,0 +1,22 @@
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Wino.Mail.ViewModels.Data;
+
+namespace Wino.Selectors
+{
+    public class AccountReorderTemplateSelector : DataTemplateSelector
+    {
+        public DataTemplate MergedAccountReorderTemplate { get; set; }
+        public DataTemplate RootAccountReorderTemplate { get; set; }
+
+        protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
+        {
+            if (item is MergedAccountProviderDetailViewModel)
+            {
+                return MergedAccountReorderTemplate;
+            }
+
+            return RootAccountReorderTemplate;
+        }
+    }
+}