Instead us a Toolbox concept which hangs off of QGCApplication

Plus lots of other tweaks to ui for visuals

Mostly accomplished by delay loading Qml elements

For QWidget we will just use the Qt default font sizes. This removes
the extra QQuickWidget creation which breaks boot Qml Profiling

Also remove Move Up and Move Down support

This is in preparation for full Qml main window

Adjusted icons so they no longer contain a background.
Added *Exclusive* functionality to the RoundButton element.
Added OnClicked signal for the drop down boxes so I could turn off Add Mission Item and Home Mode.

Made then the same size of toolbar cell height

Also moving the Plan View tool bar buttons into a Row element.

- select active vehicle
- arm/disarm
- select flight mode

Tweaking MapType and MapCenter icons
Added Zoom Plus/Minus icons to be used for maps
Added PiP icon for the upcoming Picture-in-Picture functionality

Also:
- Remove unused code