Revert "Scripts/Ulduar: Implement Mimiron"
Merge pull request #12382 from TrinityCore/revert-12268-patch_mimironnew

Revert "Scripts/Ulduar: Implement Mimiron"
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.
DB/Misc: Add gossip_menu_options and conditions to multiple trainers

By dr-j