Cherry pick stable fixes

Added configurable value grid to toolbar

Rework Fly View into separate layers which can be customized at each layer.

More FlyView encasulation. Make QGCPipOverlay completely self contained

More work on encapsulation in Fly View

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

Support for reusable InstrumentValueArea control

Refactor instrument value controls

Fix QGCPopupDialog automatic flickable parenting

Use new QGCPopupDialog mechanism

Update value visuals to support value ranges

Initial support for value ranges

Icon picker support

Icon support for values display

Fix blank display after page change in instrument panel

New grid based values page editor support

Stable update

Use global palette

Bring back visual sequence number in map item indicators

Fix even more bugs

Fix typo

Mavlink terrain protocol support

Skip invalid coords

CP - If GCS starts receiving its own coordinates, don't change the map center if it is already tracking the vehicle.

Since gstreamer is enable, we can record and do mostly everything
Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Heading value should be real so NaN comes through

Android OpenSSL support