This really just confuses everyone

Using a global .dir-locals.el file is a better alternative than
reincluding the same emacs header in every file of the project.

Further to refactor of RC_Channel class which included
adding get_xx set_xx methods, change reads and writes to the public members
to calls to  get and set functionsss

old public member(int16_t)   get function -> int16_t     set function (int16_t)
(expression where c is an object of type RC_Channel)
c.radio_in                     c.get_radio_in()           c.set_radio_in(v)
c.control_in                   c.get_control_in()         c.set_control_in(v)
c.servo_out                    c.get_servo_out()          c.set_servo_out(v)
c.pwm_out                      c.get_pwm_out()            // use existing
c.radio_out                    c.get_radio_out()          c.set_radio_out(v)
c.radio_max                    c.get_radio_max()          c.set_radio_max(v)
c.radio_min                    c.get_radio_min()          c.set_radio_min(v)
c.radio_trim                   c.get_radio_trim()         c.set_radio_trim(v);

c.min_max_configured() // return true if min and max are configured

Because data members of RC_Channels are now private and so cannot be written directly
 some overloads are provided in the Plane classes to provide the old functionality

new overload Plane::stick_mix_channel(RC_Channel *channel)
which forwards to the previously existing
void stick_mix_channel(RC_Channel *channel, int16_t &servo_out);

new overload Plane::channel_output_mixer(Rc_Channel* , RC_Channel*)const
which forwards to
(uint8_t mixing_type, int16_t & chan1, int16_t & chan2)const;

Rename functions

 RC_Channel_aux::set_radio_trim(Aux_servo_function_t function)
    to RC_Channel_aux::set_trim_to_radio_in_for(Aux_servo_function_t function)

 RC_Channel_aux::set_servo_out(Aux_servo_function_t function, int16_t value)
    to RC_Channel_aux::set_servo_out_for(Aux_servo_function_t function, int16_t value)

 Rationale:

        RC_Channel is a complicated class, which combines
        several functionalities dealing with stick inputs
        in pwm and logical units, logical and actual actuator
        outputs, unit conversion etc, etc
        The intent of this PR is to clarify existing use of
        the class. At the basic level it should now be possible
        to grep all places where private variable is set by
        searching for the set_xx function.

        (The wider purpose is to provide a more generic and
        logically simpler method of output mixing. This is a small step)

Having the version macro in the config.h and consequently in the main
vehicle header means that whenever the version changes we need to
compiler the whole vehicle again. This would not be so bad if we weren't
also appending the git hash in the version. In this case, whenever we
commit to the repository we would need to recompile everything.

Move to a separate header that is include only by its users. Then
instead of compiling everything we will compile just a few files.

this will reduce the log file size while not appreciably reducing the
ability to analyse logs

The scheduler table was still setup for a worst case CPU of
AVR2560. Adjust times for the stm32 and improve perf logging

now with much smoother attitude control thanks to some help from
Leonard

These have been moved to the AC_AttitudeControl class

This ensures we get the origin from the active EKF

* clang requires that the casting be explicit

Added update_trigger and check_digital_pin functions
added camera trigger precise time mark
detect camera feedback pin status
added support for simple digital pin
included support for digital pin. Already included in
added support for TRIGGER MSG

- inhibit crash detection warnings when disabled by param so now it can be completely disabled
- reset is_crashed when disabled by param
- fixed pre-takeoff detection bug by adding in_preLaunch_flight_stage() where we are actually in FLIGHT_NORMAL instead of FLIGHT_TAKEOFF during setup of bungee launches. This now detects if we're in that state
- simplified the use of been_auto_flying to check across all flight stages. before it was excluded to handle hand-launches which can now be detected with in_preLaunch_flight_stage()
- added impact detector timer to clamp is_flying a few seconds after an impact
- logging new impact detector as "STAT.Hit"