Allow to disable telemetry alarams (#4981)

* Allow to disable telemetry alarams

This mainly useful for cheap transceivers that have telemetry but no power amplifier and very limited range of often 10-20 meters. This includes fishpepper's tinyFISH FC (and its legal/illegal clones) and also Spektrum BNF models.

* Always disable a warning when RSSI Warnings are disabled

* Compile fix

* Fix typos, also mute sensor lost

Refactor the FrskyRSSIAlarm[2] into a EEPROM compatible RssiAlarm struct

* Compile fixes

* Also refactor Companion

* Cleanup unused datastruct on ARM

* Compile fix for AVR

* Change int to uin8_t for avr

* Fix strings

radio/src/lua/api_general.cpp

@@ -1085,8 +1085,8 @@ Get RSSI value as well as low and critical RSSI alarm levels (in dB)
 static int luaGetRSSI(lua_State * L)
 {
   lua_pushunsigned(L, min((uint8_t)99, TELEMETRY_RSSI()));
-  lua_pushunsigned(L, getRssiAlarmValue(0));
-  lua_pushunsigned(L, getRssiAlarmValue(1));
+  lua_pushunsigned(L, g_model.rssiAlarms.getWarningRssi());
+  lua_pushunsigned(L, g_model.rssiAlarms.getCriticalRssi());
   return 3;
 }