* Rename EXT option to TELEMETRY
* Change test accordingly
* Rename FRSKY to TELEMETRY_FRSKY
* Rename ARDUPILOT to TELEMETRY_ARDUPILOT
* More renames (JETI, MAVLINK, NMEA)
* Fixes to make commit-test happy
* Further tests added to commit-test
* Cleanup
* Rename EXTSTD to TELEMETRY_NONE
* Implementation of Spektrum Telemetry for the DYI Multimodule.
I can only test a subset of sensors and these look okay
* Implement conversion from Fahrenheit to Celsius
* Minor fixes for Spektrum telemetry
* Add some more sensors, show sensor ID instead of instance in the overview
* Fixes#3463: negative sensor values were invalid if filter was active for the sensor
* Re #3463: enable simultaneous use of `offset` and `filter` (was: when `offset` was enabled, the `filter` was always inactive even if enabled)
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
Bertrand Songis