ymodem file transfer

[loboris]

This is not an issue, but suggestion for adding ymodem file transfer functions in io module.
The functions are fully tested and works as expected.

queue_byte() function in components/lua_rtos/drivers/uart.c is patched to allow receiving of binnary files and ymodem protocol codes

I would also suggest changing the default console buffer length to 1040 bytes to enable receiving maximum ymodem packet length (1024 + 5) as well as adding more baud rate options.

All patches are in attached
patches.zip

Best regards.