* Add FY805 protocol
* Fix stray space
* Fix multi sending 120% instead of 100%.
* Implement a custom telemetry for the multi module
The custom telemetry allows the module to tell the telemetry protocol to OpenTX and also allows signaling the status of the Module (e.g. invalid protocol) to OpenTX
This should also close#3979.
* Cosmetics and a few small bugfixes
* remove empty if
* Move status line directly below the mode to be always visible when selecting a protocol
* warn if internal RF module is on
* Replace sprint with small helper function to build on AVR ARM (AR9X, 9XPRO, …)
* TR in wrong order, RF_PROTO_OFF inverted
* Refactor definition of Multimodule protocols to have one central place to define all multi protocol properties
* Also update protocols in companion
* Update multi version number to display as a.b.c.d
* Fix Multimodule showing up as Crossfire when only multimode and not crossfire is enabled.
* Don't hardcode telemetry to be Frysky on non STM32 arm targets
* Port multi module code to 9X platforms
* Allow Spektrum telemetry protocol to be selected as protocol for the telemetry selection
* Fix infinite loop in spektrum code
* Fix cosmetics
Changes also done for Horus and Taranis UI where appropriate
* 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
