Buzzer Support

Your blinking flashing bot can now get an upgrade, it can talk too!

This thing instructs you how to add a buzzer to your bot so that it can tell you when your build has completed, paused @ ZPos, or your safety cutoff has triggered.

Very useful if you've quarantined your bot to another room, where it's difficult to hear it printing. Attach a 100dB voice to it and be launched out of your chair when your bot needs you!

Also includes GCode support (see attached document), so you can add b