[Companion] Radio data translation/strings (#5554)

* [Companion] Add Qt tr() functions to all radio data classes instead of using generic QObject type.  (no functional changes)

* Small fix for gcc.

* Move more element name string generation to individual classes; settle on nameToString as function name.

* Also put firmware build options translations into Firmware scope.

companion/src/firmwares/telem_data.cpp

@@ -41,7 +41,7 @@ RawSourceRange FrSkyChannelData::getRange() const
   result.step = ratio / 255;
   result.min = offset * result.step;
   result.max = ratio + result.min;
-  result.unit = QObject::tr("V");
+  result.unit = tr("V");
   return result;
 }