[s2698] Some improvements to the Archaedas encounter in Uldaman.

* Spawn the Ancient Treasure chest when the boss dies.
* Correct the aura spell to be removed when he awakes.
* Add emote when he awakes.

Signed-off-by: Xfurry <xfurry@scriptdev2.com>

(based on commit cd049ba)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>