COre/Mail: Don't allow to mark delete mails as read.
Auth/Misc: Move OpenSSL version log from Warning to Information
Core/Mails: Fix exploit that allowed to take COD items without paying
Core/Mail: Do not allow to create multiple copies of mail
Core/Creatures: Fixed a typo in respawn code

Creatures should now respawn correctly in their correct time.
Closes #12378
DB/Misc: Add conditions to one mage trainer

By dr-j.
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb
更新