yaki-h8: h8 flash writer

this software is licensed by Boost Software License (v1 or later).

usage: yaki-h8 [opts...] {file}
 file:         S-record file to transfer
 options:
  -p PORT      specify serial port
  -s BAUDRATE  specify initial hand-shake speed
  -c CLOCK     specify target system clock freq
  -t BAUDRATE  specify data transfer speed
  -h           print this message


supported target: H8/3687F (other H8/300H Tiny will be work with a few hack to stub-tiny.x)