revamp of the state file

src/include/66/state.h

src/lib66/state/deps-lib/deps

src/lib66/state/state_check.c

src/lib66/state/state_get_flags.c

src/lib66/state/state_messenger.c

src/lib66/state/state_pack.c

src/lib66/state/state_read.c

src/lib66/state/state_rmfile.c

src/lib66/state/state_set_flag.c

src/lib66/state/state_unpack.c

src/lib66/state/state_write.c