code: def deleteExtraneous(component, ignore_dtstamp=False):
      
      for comp in component.components():
          deleteExtraneous(comp, ignore_dtstamp)
      for line in component.lines():
          if 'X-VOBJ-ORIGINAL-TZID' in line.params:
              del line.params['X-VOBJ-ORIGINAL-TZID']
      if ignore_dtstamp and hasattr(component, 'dtstamp_list'):
          del component.dtstamp_list
docs: Recursively walk the component's children, deleting extraneous details like
      X-VOBJ-ORIGINAL-TZID.