[2876] Fix bug in Hyjal instance script

Thanks Azelen for pointing

Close #58
[2877] Update some scripts after CMangos [12322]
[2878] Refactor and simplify code for Sartharion - Obsidian Sanctum

This will drop scripts for Disciples and Acolytes because they can be handled by the Dragon AI, and will implement the Flame Tsunami
[2879] Properly implement the Fire Cyclones for Sartharion event

This will also enable achievements 2047 and 2048
[2880] Allow Sapphiron to be spawned using GO 181356

This expects CMangos [12463]