Altitude-Hold, Better PPM support. Sonar alt-hold. Current sensor
FrSky telemetry. Cli cleanup (dump profile/master). Support for SBUS
inverter. Smaller code size - using GCC Link Time Optimisation and GCC
nano specs. Updated WS281 LED Support.
This is an alternative to #ifdef's everywhere which is getting out of
hand.
Confirmed that the VCP is working on the STM32F3Discovery board and
ChebuzzF3 variant.