I fixed more stuff!!!

-Corpse explosion for deathknight no longer lags
-Fixed Options Ui background panel not being properly set
-Npc improved Performance
-Nav mesh wasn't set on the mystery zone, so there was a error upon finding it.
-Some collection quest were not working because the objects that were to be collected deleted themselves
once you would pick up 1 of the item
-Fixed the stutter when opening up character equipment
-Fixed stutter when opening up talent tree
-Fixed stutter when opening up achievments