Landing Pattern: Loiter to alt optional support

For VTOL and FW set default landing heading to takeoff heading when TakeoffMissionItem is added in PlanView

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

VTOL Landing Pattern support

Drag of land/loiter maintains land distance/heading as appropriate

Add localization

Use Map Palette

New user model for Takeoff item

Warn about glide slope altitudes

Wizard Mode for Create Plan

FW Landing slope heights display

New QGCDynamicObjectManager support

Updated visuals

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

This way you can click anywhere

Should be all working now except for distance < radius cases.