DB/Misc: Getry (Again)

re-import sai which was not meant to be deleted (I removed unchanged sai from script but left entry in delete clause
DB/Creature: Fix  Wyrmrest Skytalon class

Closes #12689
Scripts/CoS: Added SetDespawnAtFar, fixes Arthas despawning if no players are in range

(specially during waves)
Merge branch '3.3.5' of https://github.com/TrinityCore/TrinityCore into master_revamp