View message source (#541)

* Added view message source

* Change condition to when button available

Wino.Core.Domain/Enums/MailOperation.cs

@@ -51,6 +51,7 @@
         DarkEditor,
         LightEditor,
         Print,
+        ViewMessageSource,
         DiscardLocalDraft,
         Navigate // For toast activation
     }

Wino.Core.Domain/Interfaces/IMailDialogService.cs

@@ -45,5 +45,9 @@ namespace Wino.Core.Domain.Interfaces
         /// <returns>Created alias model if not canceled.</returns>
         Task<ICreateAccountAliasDialog> ShowCreateAccountAliasDialogAsync();
 
+        /// <summary>
+        /// Presents a dialog to the user to show email source.
+        /// </summary>
+        Task ShowMessageSourceDialogAsync(string messageSource);
     }
 }

Wino.Core.Domain/Translations/en_US/resources.json

@@ -366,6 +366,7 @@
     "MailOperation_SetFlag": "Set flag",
     "MailOperation_Unarchive": "Unarchive",
     "MailOperation_Zoom": "Zoom",
+    "MailOperation_ViewMessageSource": "View message source",
     "MailsSelected": "{0} item(s) selected",
     "MarkFlagUnflag": "Mark as flagged/unflagged",
     "MarkReadUnread": "Mark as read/unread",
@@ -382,6 +383,7 @@
     "NewAccountDialog_AccountNameDefaultValue": "Personal",
     "NewAccountDialog_AccountNamePlaceholder": "eg. Personal Mail",
     "NewAccountDialog_Title": "Add New Account",
+    "MessageSourceDialog_Title": "Message source",
     "NoMailSelected": "No message selected",
     "NoMessageCrieteria": "No messages match your search criteria",
     "NoMessageEmptyFolder": "This folder is empty",