DB/Quest: Add Empowerment to Shadowmourne quest line

Thanks @Foldor. Closes #11425
Authserver: Fix typo
Core/Game: Logical fix
Core/Script: Logical fixes
DB: Fix typos in game_tele
DB/Quest: Fix reputation for repeatable Timbermaw hold quests
Core/Creatures: Added check for creature_equip_template.id = 0. 0 is a special value telling core to unequip all items