MissionItemStatus: Show seq nums, clickable selection

Add support for incomplete segment visuals

Fix command picker visuals

Use consistent "Launch" naming

Remove Fly/Plan from toolstrips

Support move item to previous item position

Make Toolstrip flickable, fix maxHeight, fix bunch of margins

Show MapScale at correct times

Can't hide fly through commands

Active ROI indication in Plan Map items

Cancel ROI support plus many big fixes

Fix show/hide of click to set Launch location

Better wordings for Takeoff item

New user model for Takeoff item

Fix gradient calc

More work on contextual Plan tools

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

RTL is no longer part of Mission Settings

Fix takeoff item insertion in plan creators

Only show split indicator on mission layer

Support for new TakeoffMissionItem and Takeoff Tool 

PolyLine -> Polyline

Warn about glide slope altitudes

Polygon/Line tool name changes

Fix Create Plan vertical spacing problem

Integrate Create Plan overlay in File DropPanel

SectionHeader no longer set width automatically

Delete icon and Command Picker ui

New centered PlanEditToolbar

Better incomplete data visuals

Fix save state checks. Show overlay on New.

Wizard Mode for Create Plan

Fix incorrect import

Update for Qt 5.11

New Create Plan support