DB/Creature: Remove more incorrect trigger flags

By dr-j, closes #11995 
Closes #7744
DB/Creature: Add some missing spawns in HoL.
Fix import
Scripts/Ulduar: Fix crash when Algalon's Big Bang is casted by player
Merge pull request #12000 from Dehravor/algalon-big-bang

Scripts/Ulduar: Fix crash when Algalon's Big Bang is casted by player
Core/GameObject: Solve some TODOs related to traps in GameObject::Update and improve logic.

Some more changes, TODO solutions and a fix for traps like those in #1359 or #6388 will follow.
Fix indention from changes in previous commit.
Core/Gameobject: Added missing break in 24ef7dbdf4b76d312cb1df44958c6ccc79bf75f4
Core/GameObject: Format comments and apply rename of previous commit.
Core/GameObject: Store unit in GameObject::SetLootState - required for trap activation.
Core/GameObject: Add missing initialization of m_lootStateUnit