Add an ucode based re-implementation of the shell script based wifi code.
The new code is jsonschema driven. The code has been refactored into several
files making it easier to follow.
The new scripts are also way faster than the previous sh implementation.
The new code is currently opt-in via WIFI_SCRIPTS_UCODE and defaults to
EXPERIMENTAL.
Signed-off-by: John Crispin <john@phrozen.org>
