Major rework to support terrain profile display and terrain collision reporting

Small visual tweaks and fixups for patterns

Remove unnecessary includes of QGroundCotrolQmlGlobal.h

Mavlink terrain protocol support

Not setting _isIncomplete correctly was causing crash

Use consistent "Launch" naming

Fix for vehicle based home position management

RTL is no longer part of Mission Settings

Support for new TakeoffMissionItem and Takeoff Tool 

Fix terrain NaN making it all the way to Planned Home altitude.

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Fixed all the bugs the new tests found

Plus low battery announce changes