Hott telemetry

Enable with the following commands:

```
feature PPM
feature SOFTSERIAL
feature TELEMETRY
set softserial_baudrate=19200
set telemetry_port=1
set telemetry_provider=1
```

FrSky on softserial is now enabled with

```
feature PPM
feature SOFTSERIAL
feature TELEMETRY
set softserial_baudrate=9600
set softserial_1_inverted=1
set telemetry_port=1
set telemetry_provider=0
```