Unregisters the module to use to import addon subclasses from.
        
        :param      module | <str> || <module>

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