The set_leds service handler is already pass-through, so the new
server-side defaults (start=0, length=rest-of-strip) work with no
code change. Refresh the field descriptions in services.yaml and
strings.json so the UI surfaces the simpler {"mode","color"} payload.
HACS-compatible custom component split out from the main LedGrab repo.
Creates light, switch, sensor, number, and select entities for each
configured LedGrab device.
alexei.dolgolyov