Removed incorrect Vehicle.altitudeWGS84

Instead us a Toolbox concept which hangs off of QGCApplication

- Delete all old map code

- New MissionManager
- Plumb MissionManager through MissionEditor
- Mission Editor supports get/set

Plus lots of other cleanup

- MultiVehicleManager is a Qml friendly replacement for UASManager
- Vehicle is a replacement for both UAS and AutoPilotPlugin

- 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

Added setter functions for HIL noise variances.  Researching methods to add zero mean gaussian random number before implementation

QGCUASParamManager and friends are replaced by FactSystem

New version using QtQuick along with an experimental Map Background

Also removed partially implemented an incorrect getCommunicationStatus
api

Also many LinkManager API changes to further isolate all link
management inside LinkManager.

So this special casing is no longer needed