Merge remote-tracking branch 'origin/master' into develop

Migrate arm_atsam print logic to use common framework (#13554)

Use string literals for `SERIAL_NUMBER` (#13403)

Merge remote-tracking branch 'origin/master' into develop

remove `#include "rgblight.h"` when `defined(RGB_MATRIX_ENABLE)` from quantum.h (#13555)

Merge remote-tracking branch 'upstream/master' into develop

Set some default configurations for GMMK Pro (#13219)

* Set some default configurations for GMMK Pro

* Remove FORCE_NKRO to avoid issues with KVMs

Dual RGB Matrix IS31FL3737 driver support to address #13442 (#13457)

* initial commit

* removed changes to write_pwm_buffer

* backward compatbility added

* fixed issue with backward compatibility

* documentation update

* removed unneccessary comment. branched from master

* updated per comments #13457

* removed blank line

* cformat on diff files

Merge remote-tracking branch 'origin/master' into develop

[Keyboard] correct the info.json for qmk configurator and add two empty layers for via (#13552)

Merge remote-tracking branch 'origin/master' into develop

[keyboard] Clueboard 2x1800 2021 Support (#13220)

* 2x1800 2021

* add support for writing a whole frame at a time

* improvements

* wip

* fix scrolling

* small tweak

* add a buffer that's larger than the display

* add the start of a font

* working upper and lower case letters

* add qmk animation

* integrate the message sign into the qmk task system

* add encoder defaults

* add MAX7219_LED_CUSTOM to config.h

* tweaks

* remove unneeded keymaps

* add a keymap showing how to control the signboard

* cleanup

* cleanup

* add a way to disable the startup test

* make it easier to define options at the keymap level

* Fix define names

Co-authored-by: Greg Cochard <gcochard@users.noreply.github.com>

* Apply suggestions from gcochard

Co-authored-by: Greg Cochard <gcochard@users.noreply.github.com>

* feedback from noroads

* format info.json

Co-authored-by: Greg Cochard <gcochard@users.noreply.github.com>

Merge remote-tracking branch 'origin/master' into develop

[Keyboard] Add Serratus PCB (#13281)

Co-authored-by: Ryan <fauxpark@gmail.com>

Merge remote-tracking branch 'origin/master' into develop

[Keyboard] Tidying up my projects and subprojects (#13289)

Co-authored-by: Erovia <Erovia@users.noreply.github.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Ethan Madden <maddene@madden.ninja>

Migrate more `fn_actions` stuff (#13502)

Merge remote-tracking branch 'origin/master' into develop

Fix some RGB Matrix-enabled keymaps referring to RGBLight mode (#13509)

Merge remote-tracking branch 'origin/master' into develop

Resolved Conflicts:
	keyboards/checkerboards/nop60/info.json