Serialize any dragonfly JSON text string back to a dragonfly object.
This includes any Model, Building, Story, Room2D, WindowParameter, or ShadingParameter.
It also includes any dragonfly energy Material, Construction, ConstructionSet, Schedule, Load, ProgramType, or Simulation object.
df_str [Required]
A text string that completely describes the dragonfly object.
df_obj
A Dragonfly object serialized from the input string.
