Returns the icon for the inputed group name.
        
        :param      groupName | <str>
                    default   | <str> || None
        
        :return     <str>

def groupIcon( cls, groupName, default = None ):
        """
        Returns the icon for the inputed group name.
        
        :param      groupName | <str>
                    default   | <str> || None
        
        :return     <str>
        """
        if ( cls._groupIcons is None ):
            cls._groupIcons = {}
            
        if ( not default ):
            default = projexui.resources.find('img/settings_32.png')
        
        return cls._groupIcons.get(nativestring(groupName), default)