ChibiOS upgrade: configuration file migrator (#9952)

* Initial commit for ChibiOS conf migration.

* Modify paths, normalise chconf.h and halconf.h to be common.

* Allow deletion of non-overridden files.

lib/python/qmk/cli/__init__.py

@@ -8,6 +8,7 @@ from milc import cli
 
 from . import c2json
 from . import cformat
+from . import chibios
 from . import compile
 from . import config
 from . import docs