Printing mails. (#471)

* Implemented printing functionality.

* Implemented icon for printing.

* Remove debug code.

Wino.Core.Domain/Enums/PrintingResult.cs

@@ -0,0 +1,10 @@
+namespace Wino.Core.Domain.Enums
+{
+    public enum PrintingResult
+    {
+        Abandoned,
+        Canceled,
+        Failed,
+        Submitted
+    }
+}