Rework flaps/spoilers logic

- remove deprecated actuator_controls[INDEX_FLAPS/SPOILERS/AIRBRAKES]
- use new topic normalized_unsigned_setpoint.msg (with instances flaps_setpoint
and spoilers_setpoint) to pass into control allocation
- remove flaps/spoiler related fields from attitude_setpoint topic
- CA: add possibility to map flaps/spoilers to any control surface
- move flaps/spoiler pitch trimming to CA (previously called DTRIM_FLAPS/SPOILER)
- move manual flaps/spoiler handling from rate to attitude controller

FW Position controller: change how negative switch readings are intepreted
for flaps/spoilers (considered negative as 0).

VTOL: Rework spoiler publishing in hover

- pushlish spoiler_setpoint.msg in the VTOL module if in hover
- also set spoilers to land configuration if in Descend mode

Allocation: add slew rate limit of 0.5 to flaps/spoilers configuration change

Instead of doing the flaps/spoilers slew rate limiting in the FW Position Controller
(which then only is applied in Auto flight), do it consistently over all flight
modes, so also for manual modes.

Signed-off-by: Silvan Fuhrer <silvan@auterion.com>

msg/ActuatorControls.msg

@@ -5,9 +5,6 @@ uint8 INDEX_ROLL = 0
 uint8 INDEX_PITCH = 1
 uint8 INDEX_YAW = 2
 uint8 INDEX_THROTTLE = 3
-uint8 INDEX_FLAPS = 4
-uint8 INDEX_SPOILERS = 5
-uint8 INDEX_AIRBRAKES = 6
 uint8 INDEX_GIMBAL_SHUTTER = 3
 uint8 INDEX_CAMERA_ZOOM = 4