Revert "Added Gunship Battle from M@R!O$"

This reverts commit f3a43f3c9eb935ecc8680b009534c2673d9e51a4.

Conflicts:
	src/server/game/Scripting/ScriptLoader.cpp
	src/server/scripts/Northrend/IcecrownCitadel/boss_gunship_battle.cpp
	src/server/scripts/Northrend/IcecrownCitadel/instance_icecrown_citadel.cpp
Revert "Added Gunship Battle from M@R!O$"

This reverts commit f3a43f3c9eb935ecc8680b009534c2673d9e51a4.

Conflicts:
	src/server/scripts/Northrend/IcecrownCitadel/instance_icecrown_citadel.cpp