Core/InstanceScript: refactored load and save methods
Merge branch 'master' of github.com:TrinityCore/TrinityCore into 4.3.4

Conflicts:
	src/server/scripts/EasternKingdoms/ZulAman/instance_zulaman.cpp
	src/server/scripts/EasternKingdoms/ZulAman/zulaman.h
	src/server/scripts/EasternKingdoms/ZulGurub/instance_zulgurub.cpp
	src/server/scripts/EasternKingdoms/ZulGurub/zulgurub.h