Paparazzi v5.8.1_stable

Maintenance release.

- ground segment: python tools fixes
- module: stereocam2state improvements/fixes
  [#1490] (
- module: fix gps_ublox
- boards: naze32: default to SERIAL (USB) flash mode
- generators: always put configure options at beginning
  [#1517] (
- generators: varous fixes for loading of modules and subsystems
- drivers: fix regression of wrong magnetometer axis on Parrot Bebop
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