Returns the names of the plugins for a given class.
        
        :param      enabled     | <bool> || None
        
        :return     [<str>, ..]

def pluginNames(cls, enabled=True):
        """
        Returns the names of the plugins for a given class.
        
        :param      enabled     | <bool> || None
        
        :return     [<str>, ..]
        """
        return map(lambda x: x.name(), cls.plugins(enabled))