flight: add gpsd service conf to image-builder

flight: add GPS to IMU + add GPS speed to HUD

uncomment BlackBox usages + stabilizer cleanup

controller: allow reversing gimbals axes

allow streaming/recording video from libcamera preview + add MJPEG streaming/recording + add audio recording

Update README.md

Add preview video to README.md

Update README.md

clean

image-builder: force fsck