building 目录参考

文件
	Building.cpp
	Building.h
	BuildingDef.cpp
	BuildingDef.h
	BuildingTypes.h
	Ghost.cpp
	Ghost.h
	PlacementSession.cpp
	PlacementSession.h
	PlacementSystem.cpp
	PlacementSystem.h
	PlacementWorld.cpp
	PlacementWorld.h