Add 'acre_api_fnc_getRadioOnOffState' to accessible method

[gerard-sog]

Is your enhancement related to a problem? NO (but not being able to easily get if radio is ON/OFF is annoying script wise).

Solution you'd like: Be able to obtain ON or OFF status of an ACRE radio.

Additional context: I created a PR to add the enhancement: https://github.com/IDI-Systems/acre2/pull/1339