Unregisters the addon defined by the given name from the class.
        
        :param      name    | <str>

def unregisterAddon(cls, name):
        """
        Unregisters the addon defined by the given name from the class.
        
        :param      name    | <str>
        """
        prop = '_{0}__addons'.format(cls.__name__)
        cmds = getattr(cls, prop, {})
        cmds.pop(name, None)