[Scripts] Update M'uru script
* Implement Darkness and Singularity
* Fix encounter reset after [3045]
* Allow DB to handle summons cleanup on reset
Credit to @xfurry [3046]
[Scripts] Fix faction of escortee Corporal Keeshan
Credit to @cala [3047]
[Scripts] Allow Skadi to cast Freezing Cloud only on one side
This will sort the flame triggers based on position and triggered aura
Credit to @xfurry [3048]