Update submodule sitl_gazebo to latest Wed Mar 11 12:38:07 UTC 2020

    - sitl_gazebo in PX4/Firmware (88c9761): PX4/PX4-SITL_gazebo-classic@8569aec
    - sitl_gazebo current upstream: PX4/PX4-SITL_gazebo-classic@458e58f
    - Changes: PX4/PX4-SITL_gazebo-classic@8569aec...458e58f

    458e58f 2020-03-10 JaeyoungLim - Fix sweep cosine (Continuing #302) (#429)
ea2568d 2019-12-27 JaeyoungLim - Increase rudder angle limit
8b905c9 2019-12-27 JaeyoungLim - Add rudder control to sitl
08f8e6f 2020-03-10 Jan-Hendrik Ewers - Update README.md
de10edd 2020-03-10 iwishiwasaneagle - Fixes PX4/PX4-SITL_gazebo-classic#424 for arch and ubuntu
4f596be 2020-03-10 Christian Clauss - Remove unused function isstring() in scripts/names.py (#346)
89db01c 2020-03-09 Matej Frančeškin - Handle MAV_CMD_SET_CAMERA_MODE
dae26ba 2020-03-08 JaeyoungLim - Handle videostream info and status
c13057d 2020-03-07 JaeyoungLim - Clear formatting and cleanups
639a6bb 2020-03-07 JaeyoungLim - Add parachute plugin
42d05bd 2020-03-09 RomanBapst - standard vtol: decrease rotorDragCoefficient to more realistic values
5669e5c 2020-03-07 leftytechie - Version check (#418)
82657d3 2020-03-07 Lorenz Meier - Fix geotagged images GPS position The GPS position was invalid, leading to incorrectly displayed geotag markers and to incorrect geotags in images.
8794a70 2020-03-02 Julian Oes - cmake: remove warning
7aba744 2020-02-26 TSC21 - gazebo_mavlink_interface: use class enum; use binary notation with the bitmask operations
0dc43a4 2020-02-26 TSC21 - gazebo_mavlink_interface: make sure to always send gyro and accel data in the HIL_SENSOR msgs
0c954a2 2020-02-25 TSC21 - mavlink_interface: split groundtruth stream from sensor stream; only apply rotations where needed
bc92d96 2020-02-25 TSC21 - set baro rate at 50Hz (averaging the PX4 baro drivers ODR)
94d16e6 2020-02-25 TSC21 - update magnetometer rate to 100Hz (fitting the ODR in most of the support PX4 mag drivers)
6cae120 2020-02-25 TSC21 - mavlink_interface: send HIL_SENSOR messages with the bitmask correctly defined IOT set each sensor stream rate separately