Simpler control design for better mobile display

Better handling of Flight Plan Complete comm lost scenarios

New Resume Mission sequence

Multi-Vehicle Start/Pause Fixes

If briefing evaluation returns no authorization, assume none is required. This is reflected in the UI as "Authorization Not Required".

* Added support for sat count to Sensors check control

* QGCCheckListItem -> PreFlightCheckButton
* CheckList -> PreFlightCheckList

Automated preflight checklist: Initial commit. Note that this requires an autopilot firmware that writes the respective health flags in the SYS_STATUS mavlink message

Signed-off-by: Patrick J.P <patrickelectric@gmail.com>

Allow plugins to define a left placement for its custom flight widget.
When placed on the left, the action tool strip is placed on the right side.

Permit refactoring
QGCButton tweaks

Moved flight planning away from "Flight Management" to its own class. Planning does not need a connected vehicle.

AirspaceManager is now exposed by QGroundControlQmlGlobal instead of Vehicle (available all the time)

Move all airmap related stuff to its own directory