Add updates to example-extras.cfg and G-Codes.md documenting pause_resume. Also add M600 (filament change) to sample-macros.cfg. Signed-off-by: Eric Callahan <arksine.code@gmail.com>
Implementation of M300 "Play Tone" Signed-off-by: Nicolas Dupont <ndupont@ndupont.net> Signed-off-by: Kevin O'Connor <kevin@koconnor.net>