Major changes and additions
Object handlers
  add_ref
  del_ref
  delete_obj
  clone_obj 
  read_property
  write_property
  get_property_ptr
  get_property_zval_ptr
  get
  set
  has_property
  unset_property
  get_properties
  get_method
  call_method
  get_constructor
  get_class_entry
  get_class_name
  compare_objects