Adds support for Planck Rev 6 (#2666)

* initial files for rev 6 with encoder

* music map init, dip scan added

* adds ws2812 driver for arm

* flesh out dip and encoder support

* adds default encoder res

* adds default encoder res

* start muse implementation

* muse working with encoder as control

* flip direction

* try mouse wheel again

* dont break other revs

* dont break other revs

* conditional autio

* pwm ws driver (not working)

* update build includes for chibios

* update ws2812 driver/config

* last commit for glasser code

* working example

* remove rgb for now

* finish up rev6

* working encoder keycodes

* add warnings to planck keymaps about the LAYOUT

keyboards/planck/keymaps/sean/keymap.c

@@ -1,6 +1,7 @@
 // This is Sean Hunter's keymap file, customized from the canonical layout file for the Quantum project.
 // If you want to add another keyboard, that is the style you want to emulate.
 
+#pragma message "You may need to add LAYOUT_planck_grid to your keymap layers - see default for an example"
 #include "planck.h"
 #include "action_layer.h"
 #include "eeconfig.h"
@@ -94,7 +95,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   {KC_LSFT, KC_LCTL, KC_LALT, KC_LGUI,   LOWER,  KC_SPC,  KC_SPC,     RAISE, KC_RGUI, KC_RALT, KC_RCTL, KC_RSFT}
 },
 
-/* 'Software Dvorak': Designed to look like dvorak in the mapping but depend on software 
+/* 'Software Dvorak': Designed to look like dvorak in the mapping but depend on software
  * dvorak (ie the OS keymapping changed to dvorak).
  * ,-----------------------------------------------------------------------------------.
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