New LandingComplexItem base class for landing patterns

Major rework to support terrain profile display and terrain collision reporting

Guard against UI Info not available causing crash

Always how command description. Better support for VTOL Takeoff. New help text for altitude on Land commands.

Correct handling of terrain ready when loading back from file

Mavlink terrain protocol support

Update vehicle heading from possible item change

Use consistent "Launch" naming

More work on contextual Plan tools

Support for new TakeoffMissionItem and Takeoff Tool 

Wizard Mode for Create Plan

New Create Plan support

Correctly handle command changes from no-coordinate item to coordinate item

Default ROI altitude to 0

Add internal error case

Support for new AltitudeFactTextField

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

setCoordinate was screwing up altitude/param7 syncronization

Fix Change Command parameter default setting