* implements leader key for planck experimental
* allows override of leader timeout
* adds ability to use the leader key in seq
* fixes leader keycode
* adds chording prototype
* fixes keycode detection
* moves music mode to quantum.c
* disables chording by default
* adds music sequencer functionality
* implements audio/music functions in quantum.c
* splits up process_action to allow independent processing of actions
* moves midi stuff to quantum.c
* adds additional scales for midi
* Updated personal layouts
* tweaked personal
* Nightly - Audio Cleanup
Refactored the LUTs. Abstracted some of the registers out of audio to
use more functional names. Split audio into audio and audio_pwm. WIP
* nightly - collapsed code
* Added check for note playing to LEDs
* Usability tweaks
* TWEAE
* nightly
added extra kcs to keymap common
* turned on Plank audio
* Added backlight breathing to atomic
* reverted accidental merge
* adds backlight pulse to planck
Jack Humbert
Erez Zukerman