Fix MAV_CMD_IMAGE_START_CAPTURE unit test usage for take photo

Fix MAV_CMD_IMAGE_START_CAPTURE usage

Update vehicle heading from possible item change

Always send MISSION_ITEM_INT to ArduPilot

Add support for incomplete segment visuals

When a child item is current show the parent as selected

64 bit fixes

Use consistent "Launch" naming

Support move item to previous item position

New constant name

Fix ArduPilot VTOL takeoff

Active ROI indication in Plan Map items

Cancel ROI support plus many big fixes

More takeoff item fixes

Fix QObject deletion

Fix gimbal pitch/yaw signalling

Fix gimbal yaw visual problems

Fix for vehicle based home position management

New user model for Takeoff item

Fix incorrect usage of _settingsItem causing crashes

More work on contextual Plan tools

Fix center drag and split side

A contextual Land/RTL tool. Better waypoint line calc.

RTL is no longer part of Mission Settings

Fix takeoff item insertion in plan creators

More work getting _addMissionSetting right

Update unit test for no auto takeoff item add

Fix handling of _addMissionSettings

Support for new TakeoffMissionItem and Takeoff Tool 

PolyLine -> Polyline

Polygon/Line tool name changes

Fixed unused variable

Integrate Create Plan overlay in File DropPanel

New centered PlanEditToolbar