updates midi functionality (#331)

* 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

Leader key implementation (#326)

* 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

* updates process_action functions to return bool

Merge branch 'master' of https://github.com/jackhumbert/qmk_firmware

Backlight Breathing for Planck and Atomic

* 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 & Erez] Removes duplicate reference, sorts whitespace

Merge branch 'master' of https://github.com/jackhumbert/qmk_firmware

Clarified audio.c (#302)

* 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

Merge branch 'master' of https://github.com/jackhumbert/qmk_firmware

Merge branch 'master' of https://github.com/jackhumbert/qmk_firmware

restructures audio, begins voicing

Merge remote-tracking branch 'refs/remotes/origin/personal_atomic_planck'

Adding Musical Notes

Merge branch 'master' of https://github.com/jackhumbert/qmk_firmware

added keymap_extras to path

Merge pull request #256 from jackhumbert/new_defaults

New default planck layout, audio fixes, makefile overwrites, tri-layer quantum-wide

Prepping for merge with new_defaults

the spacessss

fixed merging

Merge remote-tracking branch 'remotes/jackhumbert/new_defaults'

changing up the makefile a bit