Florian Achermann 84578748f4 Navigator Mission RTL (#8749)
* Add return to land to mission

This method uses the planned mission for rtl. If a landing sequence
is present it will continue the mission and land. If not it will
fly back the mission and loiter/land at the home position.
2018-05-27 12:07:06 -04:00
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2018-05-27 12:07:06 -04:00