Create a list of exterior modifiers that can be used to edit or create a ModifierSet object.
exterior_wall
A modifier object for exterior walls (or text for the identifier of the modifier within the library).
exterior_roof
A modifier object for exterior roofs (or text for the identifier of the modifier within the library).
exposed_floor
A modifier object for exposed floors (or text for the identifier of the modifier within the library).
exterior_set
A list of exterior modifiers that can be used to edit or create a ModifierSet object.