We are running out of flash space in AeroFC so a cleanup is necessary.

Tools not used in Aero RTF, INAV, fixed wing control, vtol control and
unused libs was removed.

before
$ size build_aerofc-v1_default/src/firmware/nuttx/firmware_nuttx
   text    data     bss     dec     hex filename
 956880    3524   14608  975012   ee0a4 firmware_nuttx

after
$ size build_aerofc-v1_default/src/firmware/nuttx/firmware_nuttx
   text    data     bss     dec     hex filename
 832200    3508   14616  850324   cf994 build_aerofc-v1_default/src/firmware/nuttx/firmware_nuttx

Note: ecl needs to be updated at the same time
because as soon as the ecl is compiled within PX4 Firmware
the matrix submodule checked out by PX4 Firmware is used
for every call to a matrix or quaternion.

This error definitions already existed in QGC

This allows to get very accurate readings from the SDP3x sensor series from Sensirion using a complete sensor model.

At 90 degrees the yaw is extremely unstable (tested with HIL), it
overshoots and only very slowly converges to the correct value.
This behavior is also noticable with lower angles, but not so extreme.
It definitely needs to be looked into further, but for now this makes it
safer.