solo-1.1.0-gimbalbeta

diff from solo-1.0.8:

• blind merge of the following PRs:
  • #61 (gyro 3 for rate control)
  • #77 (compass calibrator refactor)
  • #79 (remote logging)
  • #82 (body-locked control loop for gimbal)
  • #83 (remove mavlink routing workaround for gimbal)
  • #99 (gimbal dataflash logging)