Major update to simplify and document the custom build example

Support for reusable InstrumentValueArea control

Icon support for values display

New grid based values page editor support

Move analyze page list model to the core plugin.

Pay attention to the current camera auto stream capabilities directly rather than just camera changes.

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

Support custom build override of available complex items

Custom build override for stable version check no longer needed

Stable desktop version check

Support GuidedActionsController logging

Expose root plan keys

Also rename QmlPageInfo to QmlComponentInfo to cover more use cases

Also plugin'ize intrument panel PageView pages

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Also added Vehicle.flightTime to default setup