Scripts/Ulduar: Yogg-Saron

Known issues:
- encounter doesn't start immediately after you enter the room, you need to go closer
- players standing outside of the room are not turned Insane after 15 seconds
- encounter resets if the last living player is gripped by Constrictor Tentacle or encased in Hodir's Flash Freeze
- Hodir won't freeze multiple players when they die at the same moment
- Flash Freeze missile (64176) won't hit anybody, probably cast too soon
- once keepers are chosen to help you, there probably shouldn't be option to let them despawn (it happens on grid despawn so you can choose another ones or different keeper count)
- there are some unused spells, don't know when or why they should be cast
- some spell visuals hit multiple players, but they shouldn't do that