Copter: remove inav check

the EKF check works reliably but attempts to check the inertial nav for
errors has not been successful.  I could not find a way to reliably
catch flyaways without also introducing false positives (and thus
unwanted LANDings)
Git: ignore Build.AntennaTracker
Frame Parameters: Updated Mode Switch order
AC_AttitudeControl_Heli: Create Flybar Passthrough flag which will be used for control pass-through.
TradHeli: Add pointer for pilot roll/pitch inputs to attitude_control constructor. To be used for flybar passthrough.
AC_AttitudeControl_Heli: Add passthrough_to_motor_roll_pitch function.
AC_AttitudeControl_Heli: Add use_flybar_passthrough accessor function.
TradHeli: Set Flybar passthrough mode in Acro Initialization function.
TradHeli: Reset flybar passthrough to false when exiting Acro mode.
TradHeli: Add yaw-only rate request function for flybar acro mode.
Logging: Fix comment error.
AC_AttControlHeli: add passthrough_bf_roll_pitch_rate_yaw
TradHeli: call passthrough_bf_roll_pitch_rate_yaw
TradHeli: update AttControlHeli constructor

reference to rc_1, rc2 are replaced with constant updates during
acro_run
AP_Notify: avoid suspend_timer_procs() by using atomic updates in ToshibaLED_PX4
AP_InertialSensor: use lockless structures in MPU9250 driver

this avoids suspending timers when transferring data between main
thread and SPI read thread
HAL_Linux: use a semaphore in suspend_timer_procs()

this is the start of multi-core aware code
Copter: show firmware version on param fetch

fixes pull #1320

thanks Arthur!
Rover: show firmware version on param list
Rover: remove unused variable