[2824] Implement gauntlet event for Hadronox - Azjol-Nerub

Also slightly improve script for Krik'thir

This will also implement achievement 1297 - Hadronox Denied

Conflicts:
	scripts/northrend/azjol-nerub/azjol-nerub/azjol-nerub.h
	scripts/northrend/azjol-nerub/azjol-nerub/boss_hadronox.cpp
	sd2_revision_nr.h