QMK CLI and JSON keymap support (#6176)

* Script to generate keymap.c from JSON file.

* Support for keymap.json

* Add a warning about the keymap.c getting overwritten.

* Fix keymap generating

* Install the python deps

* Flesh out more of the python environment

* Remove defunct json2keymap

* Style everything with yapf

* Polish up python support

* Hide json keymap.c into the .build dir

* Polish up qmk-compile-json

* Make milc work with positional arguments

* Fix a couple small things

* Fix some errors and make the CLI more understandable

* Make the qmk wrapper more robust

* Add basic QMK Doctor

* Clean up docstrings and flesh them out as needed

* remove unused compile_firmware() function

util/freebsd_install.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+util_dir=$(dirname "$0")
 pkg update
 pkg install -y \
 	git \
@@ -17,3 +18,4 @@ pkg install -y \
 	arm-none-eabi-newlib \
 	diffutils \
 	python3
+pip3 install -r ${util_dir}/../requirements.txt