updates midi in play_note to better octave

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

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

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

Merge pull request #271 from eltang/qmk_firmware/eeprom_wear_fix

Update functions used to write to EEPROM

Update functions used to write to EEPROM

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

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

merging

Fixed many compiler warnings related to print being disabled

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

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

Merge branch 'master' into flicker-fix

Merge pull request #104 from jackhumbert/smarkefile

Rework Planck file structure

Merge branch 'audio' of https://github.com/jackhumbert/tmk_keyboard into smarkefile