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/macos_install.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+util_dir=$(dirname "$0")
+
 if ! brew --version 2>&1 > /dev/null; then
 	echo "Error! Homebrew not installed or broken!"
 	echo -n "Would you like to install homebrew now? [y/n] "
@@ -24,3 +26,4 @@ brew tap PX4/homebrew-px4
 brew update
 brew install avr-gcc@8 gcc-arm-none-eabi dfu-programmer avrdude dfu-util python3
 brew link --force avr-gcc@8
+pip3 install -r ${util_dir}/../requirements.txt