code: def groupIcon( cls, groupName, default = None ):
          
          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)
docs: Returns the icon for the inputed group name.
          
          :param      groupName | <str>
                      default   | <str> || None
          
          :return     <str>