[FR] Custom GCode after Cooldown

[lightmaster]

You can customize GCode that runs before Preheat starts and after Preheat is complete, but how about after a Preheat is cancelled by pressing the Cooldown button. This GCode would run directly after the M104 and M140 commands that set temp to 0C. While others may find a different use for it, I would be using it to revert the LEDs back to white after a preheat is cancelled, since they will remain whatever color they were during the preheat cycle.