camera view commands

def cmd_cameraview(self, args):
        '''camera view commands'''
        state = self
        if args and args[0] == 'set':
            if len(args) < 3:
                state.view_settings.show_all()
            else:
                state.view_settings.set(args[1], args[2])
                state.update_col()
        else:
            print('usage: cameraview set')