nbody: in util library, use stdbool.h instead of custom enum
nbody: in util library, use stdbool.h instead of custom enum

paperscape/paperscape-mapgen,paperscape/paperscape-backend,paperscape/paperscape-mapgen,paperscape/paperscape-backend,paperscape/paperscape-mapgen,paperscape/paperscape-backend,paperscape/paperscape-mapgen,paperscape/paperscape-backend