S.PORT to Lua telemetry passthrough

The Fifo is created with ```telemetryRegister``` and elements (ID + Value) are taken from the Fifo with ```telemetryPop```
Not tested at all. Just for review / discussion

radio/src/targets/taranis/serial2_driver.cpp

@@ -21,9 +21,9 @@
 #include "../../opentx.h"
 
 uint8_t serial2Mode = 0;
-Fifo<512> serial2TxFifo;
-extern Fifo<512> telemetryFifo;
-extern Fifo<32> sbusFifo;
+Fifo<uint8_t, 512> serial2TxFifo;
+extern Fifo<uint8_t, 512> telemetryFifo;
+extern Fifo<uint8_t, 32> sbusFifo;
 
 void uart3Setup(unsigned int baudrate)
 {