Scripts/Auchindoun: Update Talon King Ikiss' script to EventMaps

Codestyle

Missing include
DB/Misc: Random fixes

A few random fixes,

* Manaforge Coruu Credit
* Summon time for creatures summoned at at to prevent premature despawn (occured only with tirion on 3rd set of wp)
* Script for Destroy the Forges, closes #12825
Scripts/UtgardeKeep: Update Skarvald & Dalronn scripts to EventMaps

* Simplified creature_texts enum that was sort of confusing
* Removed hack to spawn ghosts using the proper spells
Merge pull request #12978 from Nyeriah/patch-auchi

Scripts/Auchindoun: Update Talon King Ikiss' script to EventMaps
Merge pull request #12992 from Nyeriah/patch-uk

Scripts/UtgardeKeep: Update Skarvald & Dalronn scripts to EventMaps
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore