So far the serial output is a mix of \r\n for println() and \n for
sprintf() and such.
This commit consolidates this to a consistent \r\n.
There should be no noticeable difference for users of terminals that
auto-substitute a sole \n to \r\n.
This will however make the serial output friendly to default behavior of
various terminal emulators like 'screen' and 'minicom'.
This commit doesn't touch anything that is not serial output and also
leaves 'ets_printf' alone just in case.
Co-authored-by: Thomas B. Rücker <thomas.ruecker@relexsolutions.com>
e1bf5dc9a9