Firmware CLI parameters from FPV-DB (https://fpv-db.com/firmware/)

<firmware>/<version>.json: every CLI setting of the release - type, range or
value list, default, the settings.c line it is defined on and the line that
sets its default. <firmware>/index.json lists the releases and the sourced renames.
Defaults are the firmware's own (CLI `get` on a SITL build, no board config);
null where they depend on the build, with the reason in default_note.

License: GPL-3.0-only. The data is derived from the firmware source, which is
GPL-3.0; see each file's repo and commit.
