This mode is not really used and not even recommended. It is also not
implemented in all firmwares. If a direct call to stabilization command
is needed, it should be done with a specific function but not from a
builtin instruction from the flight plan.

It was discussed in #3208, but not applyied because of nav_heli_spinup.
A new h_mode 'NONE' allows to disable guidance and stabilization while in
NAV mode, which allows to set directly the commands.

After #3197, the functions guidance_h_set_xxx are reseting the state so
it creates inconsistent behavior when abusing the 'set_pos' to update
the gcs display.

…#3235)

- update Enac rotorcraft airframes
- remove dead aircraft
- add jsbsim model files
- update bebop2 example

* [airframes] rot_wing airframe updates

* Updated small rot_wing drones

* Updated rot_wing_v3f calibrations

Based on St ULD

…n-zero)