using different values in different.
The cause was the IMU init code which triggered calculation was never
called after switching profiles - it couldn't be called twice because it
also initialised the compass.
The solution was to decouple compass initialisation from IMU
initialisation and extract the code to recalculate throttle angle scale
to a new method.
The MSP is changed in a way that might provide some backwards
compatibility. The first 4 channels are sent/read as before followed by
the next 4 channels.
If I client ignores extra data received it should be backwards
compatible.
Clients can looks for the new capability bit which indicates the MSP
protocol supports AUX 1-8.
