Create a list of ground constructions that can be used to edit or create a ConstructionSet object.
ground_wall
A construction object for underground walls (or text for the identifier of the construction within the library).
ground_roof
A construction object for underground roofs (or text for the identifier of the construction within the library).
ground_floor
A construction object for ground-contact floors (or text for the identifier of the construction within the library).
ground_set
A list of ground constructions that can be used to edit or create a ConstructionSet object.