* XMMX: matrix and keymap refactor
- xmmx.h updated to use #pragma once
- renamed LAYOUT_ansi_wk macro to LAYOUT_tkl_ansi
- renamed LAYOUT_ansi_wkl macro to LAYOUT_tkl_ansi_wkl
- renamed LAYOUT_iso_wk macro to LAYOUT_tkl_iso
- renamed LAYOUT_iso_wkl macro to LAYOUT_tkl_iso_wkl
* XMMX: Configurator support
* XMMX: readme update
* pull out toad keyboard and get it compiling
* refactor xmmx
* use the correct LAYOUT macros
* move LED code out to toad.c file
* move LED code out to xmmx.c file
* adjust for correct number of columns and pins used
* remove led set user
* Remove chording as it is not documented, not used, and needs work.
* Make Leader Key an optional feature.
* Switch from `PREVENT_STUCK_MODIFIERS` to `STRICT_LAYER_RELEASE`
* Remove `#define PREVENT_STUCK_MODIFIERS` from keymaps.
