Allow mixer upload when PWM is on
respect NAV_TAKEOFF_ALT instead of using hardcoded default takeoff value
multirotor_pos_control: added takeoff gap (hardcoded 3m), fixed code style
Added parameter NAV_TAKEOFF_GAP
Set sane defaults for F330
v4 compatibility
MAVLink workaround
Hotfix for USB: Starting MAVLink only on USB if connected. Needs rewrite of MAVLink and delay / retries for correct approach