* Only clear sensor.persistentValue when the sensor.persistent is disabled and not on every shutdown.
* Only show persistent option for calculated type sensors (only these actually get saved in EEPROM)
I did a refactoring for the latitude and longitude decoding which should be tested carefully for FrSky S.PORT and D telemetry
There was a double conversion in S.PORT protocol, there are less maths now, and perhaps precision will be better