Add option --no-tty-restore / -N that omits tty_restore() call #334

On exit, do not reset the tty device settings to the state they were in
before the program started.
This is effective when sending characters at a low baud rate and then
immediately exiting, to ensure that the last character is output
correctly.

README.md

@@ -122,6 +122,7 @@ Options:
       --exclude-drivers <pattern>        Exclude drivers by pattern
       --exclude-tids <pattern>           Exclude topology IDs by pattern
   -n, --no-reconnect                     Do not reconnect
+  -N, --no-tty-restore                   Do not restore initial TTY device settings
   -e, --local-echo                       Enable local echo
       --input-mode normal|hex|line       Select input mode (default: normal)
       --output-mode normal|hex|hexN      Select output mode (default: normal)