The one hat axis should be 4 for Unix/Linux and 6 for windows (according
to someone on IRC), while the other hat axis is apparently 7 for all
systems. Changed the throttle to Nasal, too.
I didn't nasalify the rest, because that's error-prone and I wouldn't
be able to test it.
controls in the cockpit vs. which wheels they apply to. FlightGear now
sets /controls/gear/brake-left, /controls/gear/brake-right, and
/controls/gear/brake-parking. It should be up to the FDM to sort out
which wheels under which circumstances are affected by these controls
and ultimately what happens to the physical motion of the aircraft.
