Schwabe/multi telemetry (#4151)

* 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

companion/src/eeprominterface.cpp

@@ -1831,14 +1831,18 @@ unsigned int getNumSubtypes(MultiModuleRFProtocols type) {
     case MM_RF_PROTO_KN:
     case MM_RF_PROTO_SLT:
     case MM_RF_PROTO_Q2X2:
+    case MM_RF_PROTO_FY326:
+    case MM_RF_PROTO_BAYANG:
+    case MM_RF_PROTO_V2X2:
       return 2;
 
     case MM_RF_PROTO_CG023:
-    case MM_RF_PROTO_MT99XX:
       return 3;
 
     case MM_RF_PROTO_FRSKY:
     case MM_RF_PROTO_DSM2:
+    case MM_RF_PROTO_MT99XX:
+    case MM_RF_PROTO_HONTAI:
     case MM_RF_PROTO_AFHDS2A:
       return 4;