Instead us a Toolbox concept which hangs off of QGCApplication

- Also added new adjustMavlinkMessage support

- FirmwarePlugin is the new place for code which is specific to
firmware flight stack
- FirmwarePlugin currently supports flight mode apis
- Modify code to use new FirmwarePlugin support

Passing parameters QVariantMap across C++ boundary was causing crashes
in Qt due to Qml array bugs. Referencing same Fact* across Qml boundary
in multiple QQuickWidgets caused jScript GC to crash.

Since this is generic Qml support not specific to FactSystem

- properties now hand off of main “autopilot” object in qml
- Added support for summary items through qml

Allows parameter access from QML among other things

Used for unit testing