Updated DEFINED_OBJECTS_DICT in NamespaceParser to account for CybOX v2.0 changes
Added namespace/alias and object import code
Updated objects; refactored GDSClassesMapping dictionary to hold only directed related types
Fixed minor bug
Fixed issues in boolean value buildchildren calls
Added proper xsi:type handling to ObjectPropertiesType
Fixed name of Observables element output to Observables from ObservablesType
Updated all objects to pass through xsi_type to parent (ObjectPropertiesType)