[nps] Started to add fixed wing support in NPS
[rotorcraft] improve in_flight detection heuristic

Simply checks if thrust, speed and acceleration are above a threshold.
Does not rely on RC thrust command anymore, but only on actual thrust command.
Not tested on real vehicle at all so far...

Attempt to improve issue #201 and replaces #468
[nps] A few more NPS for FW updates

 * tweaked FBW for USE_NPS, not SITL
 * Better support for AP or FBW or both
 * added start of a subsystem makefile
[fixedwing] energy_ctrl: don't keywords reserved in c++
[modules] light only for ap
[modules] only use sim_air_speed if not using NPS

for now...
[fixedwing] gps for nps sim
[fixedwing] cleanup autopilot makefile a bit
[fixedwing] ahrs and ins subsystems for nps target
[nps][fixedwing] updates for fixedwing support in NPS
[nps] minor cleanup
[boards] correct include guard for apogee 1.0
[conf] configurable spi for aspirin_2
[lisa] comments for the tunnel
[rotorcraft] ins_int_extended without sonar
[rotorcraft] AHRS_FLOAT flag for float_cmpl_quat
[rotorcraft][stabilization] move some macros
[rotorcraft] CAUTION! stabilization int_quat ref model scaling fixes

Now the attitude reference should finally have the correct scaling.

For end users that means it is not so sluggish on RC input anymore and you should get a snappy reference.
CAUTION! Test fly carefully, you might need to lower the gains.
[rotorcraft][stabilization_ref_quat] saturate rate and trim accel
[conf] stm32f4 discovery test board files