Initial support for ArduCopter SafeRTL

Better Guided Action support for ArduPilot

Allow disconnect/reconnect of RTK GPS

Stable merge

Resume Mission: Fix up sequence numbers and current item

Save App Log failing on Android

Rename camera modes for usability

Flight Speed changes were not flowing through rest of mission items

Add distance to home to Vehicle FactGroup

Resume mission fixes

* Resume index adjust to previous coordinate command
* Takeoff always added to resume mission
* Remove camera id checks which are no longer part of spec
* Simplified de-dup logic

Rework disabling of setup pages

Survey fixes

MockLink: Simulate movement of ADSB vehicle

CustomMapItems: Fix object creation