Previously load stats were stored outside of the printloop, but
with the refactoring to save memory state was reset and used in
the first loop before the actual load calculations were valid.

Fixed by moving the summary info to the bottom of the top printout
after everything is computed. Also restructured the callback to
not depend on a line counter and fixed astyle glitches.

vmount is now added to the startup script, however, it will only start
if the param MNT_MODE_IN is set to anything but -1.

To reduce latency of the output update when mode is set to auto.

MNT_MODE_IN 0 now means to automatically check all inputs.

The control_data pointer wasn't correctly set for the cases where there
actually was a change/command.

It is not convenient having to change a parameter to change a gimbal
from RC input to mavlink input mode or back. This refactor changes the
behaviour to use whatever is available, RC or mavlink commands.

Once a mavlink command is followed, control can be taken back using RC,
however, this requires a clear stick change.

Changed "private" keyword used for argument to "priv"

  The Make.defs compisition is

    ARCHWARNINGS		 = $(PX4_ARCHWARNINGS)
    ARCHCWARNINGS		 = $(PX4_ARCHWARNINGS) $(PX4_ARCHCWARNINGS)
    ARCHWARNINGSXX		 = $(ARCHWARNINGS) $(PX4_ARCHWARNINGSXX)

so the pieces from nuttx-configs/PX4_Warnings.mk should not be combined.

   Reinstate unused checks.

extend where needed, only keep the full list for 4001 (and 4002 which differs)

There was already an airframe with id 4002.