[imu] enable sign/sens defaults for aspirin_v2.2 as well
[AOA] some cleaning of the angle of attack module
[gps] fix skytraq binary parser: correct scaling and signed values, thx for reporting Gerard
while here clean up a little
hopefully finally closes #167
[airframes] update imu/ahrs freq conf for aspirin in microjet lisa/m example
[electrical] fix missing defined
[tests] fix test_baro for lisa
[sw/ext] update libopencm3 to latest master
[sw/ext] only build stm32 targets of libopencm3
[stm32] update can for latest libopencm3