this is useful when testing merge work

when USB is unplugged, switch baud rate to the SERIAL3_BAUD rate from
EEPROM

builds, but not tested yet

vtable error

Logging isn't always enabled

useful for automatically handling copter vs plane

this adds register level emulation of the ADS7844 and the RC
input/output hardware on the APM1, allowing for SITL testing without
enabling HIL in the code

this error is harmless, but false positives can disguise real errors

* I have not tested any of these on real hardware.

this makes the orientation clearer

* requires new stub libraries for InertialSensor and PeriodicProcess.

* Also added dummy ivar to APM_BMP085_hil

this tries to make the #ifdef nesting easier to understand

fixed a link error in Desktop build

thanks to Pat for the C++ foo