docs: def unregisterAddonModule(cls, module):
          """
          Unregisters the module to use to import addon subclasses from.
          
          :param      module | <str> || <module>
          """
          prop = '_{0}__addon_modules'.format(cls.__name__)
          mods = getattr(cls, prop, set())
          try:
              mods.remove(module)
          except KeyError:
              pass