SSL Handshake Prompt for IMAP (#381)

* Fix an incorrect namespace for copy auth url request.

* Implemented SSL handshake process for testing imap configuration.

* Implemented SSL handshake process for testing imap configuration.

* Replace certificate PathIcon with WinoFontIcon in XAML.

Wino.Core.Domain/Extensions/ExceptionExtensions.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+
+namespace Wino.Core.Domain.Extensions
+{
+    public static class ExceptionExtensions
+    {
+        public static IEnumerable<Exception> GetInnerExceptions(this Exception ex)
+        {
+            if (ex == null)
+            {
+                throw new ArgumentNullException("ex");
+            }
+
+            var innerException = ex;
+            do
+            {
+                yield return innerException;
+                innerException = innerException.InnerException;
+            }
+            while (innerException != null);
+        }
+    }
+}