Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

3x4.h
#pragma once

#include "quantum.h"
#define LAYOUT( \
    K00, K01, K02, K03,  \
    K10, K11, K12, K13,  \
    K20, K21, K22, K23 \
    ) { \
        {K00, K01, K02, K03}, \
        {K10, K11, K12, K13}, \
        {K20, K21, K22, K23} \
    }