style: [patch 1/22] use /r/3648/ to reorganize includes

types: clean up types, especially signed vs unsigned

atomicio: provide atomic read and write functions.

These functions keep trying to read and write until all data has been
transferred, or an error occurrs. In the case where an end of file
hasn't been reached, but all of the bytes have not been read/written,
try again. On EINTR, try again.