Fix centerViewport calculation

Fix SplitSegment insertion

Remove all case missing current index notification

Allow split of current segment

Add Terrain toggle to MapScale control

More work on direction arrows

Zoom buttons move to MapScale control

Toggle Rally Point insertion on/off.
Highlight current Rally Point and current Waypoint.
Use tab bar instead of a row of radio buttons for selection (Mission, Fence, Rally).
Fix QGCHoverButton to handle proper checked state toggle.
Get rid of the many arrays used to define behaviors for the ToolStrip. They are now all defined within its model.
Fixed color for disabled text within ToolStrip (it was invisible)

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.

Make ToolStrip font smaller (Desktop builds)
Check for auto configured video stream before testing video source type

Add support for geofence return point. Also fixed a bunch of bugs in geofence and rally point support.

Restore QGC to its normal UI layout (buttons on toolbar)

Fixed flight widget position.

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

Waypoints only mode tweaks

Hide ROI

Visual cleanup

Fix double survey load from shape

Fix Plan save message on exit

Replacing colors with the ones provided by Airmap.
Adding border color and width.
Adding airspace ID so it can later be linked to the advisory list.

Added some basic color management for airspaces

Handle flight start/end time
Handle start/stop traffic monitor
Only start telemetry if enabled
Added a "Now" button for the flight start time
Collect advisories only when the rules change

Updates in general was only done if a POI changed. This caused changes related to something other than a change in POI to be ignore. The code now "resets" the POI when such changes occur (change of ruleset for example).
Ruleset selection is was not persistent. When reloading the list of rulesets for a given region, any previously selected ruleset would be reset to defaults.
Also fixed several new clang warnings.

* Load Plan
* Save to KML
* Load Plan (it tries to load KML instead)