Allows properly keyed radios to broadcast in robot talk and/or hivemind + some cleanup

* Allows properly keyed radios to broadcast in robot talk and/or hivemind
* Fixes encryption key w_class
* Cleans up used_radio handling in saycode
* Removes unused devices/radio code

I can open this on the main repo if you prefer.
Would be it be worth making the translation vars into a list? Then you could iterate through it and translate arbitrary broadcast languages.