Major rework to support terrain profile display and terrain collision reporting

Propagate opacity and interactive properties to mission items
Set opacity to 0.5 for items that are not part of the current
edit view

Fix typo

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

Fix center drag and split side

Polygon/Line tool name changes

New centered PlanEditToolbar

New Create Plan support

Button name changes

Corridor edit toolbar

New editing tools support

Use new SplitIndicator control

Update all files that use a QML Menu item to QtQuick.Controls 2.4 to solve the issue of a menu showing up in random places on Android.

Get rid of QGCView, QGCViewPanel and FactPanel. All messages and dialogs are now handled in the root window.

Preserve clockwise winding when adjusting vertices

Add support for edit position dialog on vertices

Respect app units

Fixed issue where the "Set Circle Radius" menu entry was trying to affect the visibility of an item within a component.

Fixed issue where the "Set Circle Radius" menu entry was trying to affect the visibility of an item within a component.

This gives drag clicks precedence over splitting.