correctly calculate attitude
fix GPS alt message - expects alt in m + 1000, 0 - 5000 m - from vierfuffzig <tunella@gmx.de>
fix used battery capacity - from vierfuffzig <tunella@gmx.de>
battery and heartbeat telemetry
parse VTX packets and VTX telemetry
provide GPS, Battery, Attitude, FlightMode telemetry
issue parameter updates at scheduled rate
support setting power levels with dbm
support standalone mode
set defaults from incoming VTX packets
output configured VTX settings