tio v3.6

• Add configuration file include directive

  To include the contents of another configuration file simply do e.g.:

  [include raspberrypi.conf]

  Also, included file can include other files which can include other files etc.

  This feature is useful for managing many configuration files and sharing configuration files with others.

• Mention how to list key commands in help output

• Fix hex output mode when using normal input mode

  In this combination of modes the input character was not forwarded to the tty device. This fix makes sure it is forwarded.

• Fix uptime on MacOS

  On MacOS the birth time is apparently not available so we use modification time instead.

• Improve warning upon failing connect

  Add device path to warning when connect fails.

• Fix crashy search_reset() on macOS

• Clean up shadow variable

• Clean up readline code

• Improve listing of long device names

• Fix listing of serial devices on macOS

• Print correct 'Done' timestamp for X- and Y-modem transfers

  Call tio_printf() after completing xymodem_send().

• Recompute listing_device_name_length_max for MacOS case, too.