Major rewrite of Survey generation for simplicity. Also includes support for CONDITION_GATE.

Fix ArduPilot fake home position handling

Mavlink terrain protocol support

Added compiler switch for developers to generate survey preset default json files for use as built-in survey presets in custom builds

Support for built-in preset delete prevention

Fix load order so isManualCamera returns correct value

Show errors from preset load failures

Fix Done Tracing <-> Done PolyFoo in wizard relationship

Avoid arrow positioning with take item

Fix typo

Track trace mode in polygon so we can use it to exit wizard mode

Fix current item updating after delete

Not setting _isIncomplete correctly was causing crash

Fix Plan insert Takeoff/Land for correct enable state and insert into correct place. 

Plan: Make PX4 VTOL takeoff work like fixed wing

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 for vehicle based home position management

New user model for Takeoff item