rename get_cell_id -> find_discrete_state, and refactor it
rename get_cell_id -> find_discrete_state, and refactor it

tulip-control/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control,necozay/tulip-control,necozay/tulip-control,necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control,necozay/tulip-control