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 handling the toggling of the various panes on the right side of the screen to match the current selected task.

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

Replacing some icons, cleaning up help text, etc.

- Delete all old map code

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

Too complicated supporting both modes as editor becomes more complex

- Restructured a number of MissionItem properties as well

- Moved all MavManager functionality to Vehicle
- Updated all code to use Vehicle instead of MavManager
- Removed MavManager