Removed incorrect Vehicle.altitudeWGS84

Plumb through initial object mode on Vehicle

- Also fix vehicle selector dropdown in toolbar

Selected flight mode is controller by firmware. Use selecting flight
mode cannot set the check, or it will be wrong if firmware declines
change.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Windows OS doesn’t disconnect port when you pull plug on USB. This
caused all sorts of problems with previous logic. New logic handles
this correctly.

And other toolbar fixes...

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

It was using wrong size variable (and consequently too big)

Instead us a Toolbox concept which hangs off of QGCApplication