(refs #3513) Not check about deleted or draft unread message.
 (refs #3513) Not show about deleted or draft message in list page.
(refs #3513) Not show about deleted or draft message in api results.
(refs #3513) Commonized processing in MessageSendListTable.
(refs #3513) set sender api user in message search API.
Merge branch 't3513-hidden-to-deleted-message' of github.com:ShinichiU/opMessagePlugin into t-3515