Fix EYE device driver
Device EYE has no working pitch and roll values, gyro not available.
AHRS set configurable in drawTRI, it does not check for valid values and in case of external
system no more sending data it does not change to normal TRI. Furthermore it is sharing the same init switch of TRI, so they cannot coexist. However it is left working for who has a real gyro.
Fix TAS>IAS and IAS>TAS conversion using pressure altitude and not qnh altitude in CAI302, compeo, digifly, Flytec and Zander.