Log Message:
tio: update to 1.40.

Changes since tio v1.39:

 * Add config support for log-strip

 * Add config support for hex-mode

 * Rename --hex to --hex-mode

 * Fix completion for -e, --local-echo

 * Ignore newlines in hex output

 * Fix newline in warning_printf()

 * Fix ansi_printf_raw() in no color mode

 * Enter non-interactive mode when piping to tio

   Add support for a non interactive mode which allows other application to
   pipe data to tio which then forwards the data to the connected serial
   device.

   Non ineractive means that tio does not react to interactive key commands
   in the incoming stream. This allows users to pipe binary data directly
   to the connected serial device.

   Example use:

   $ cat commands.txt | tio /dev/ttyUSB0

 * Also strip backspace from log

   To make log strip feature consistent so that we remove all unprintable
   control characters and escape sequences.

 * Socket code cleanup

 * Cleanup man page

 * Rename --log-filename to --log-file

Yin Fengwei:

 * Allow strip escape sequence characters from log file