Refactor name Hub to Protocol
|Target version:||3.0 FrSky hub and sensors|
The newer FrSky sensors use the hub protocol, without using the hub (e.g. the FAS-100 can be directly plugged into the Rx)
We should probably refactor our naming convention so that we ask the user what protocol is used on his model. I.e. FrSky hub protocol, instead of asking him what hub he has.