Also additional major Mission usability changes

Also remove concept of “interactive” since it is no longer needed

Also show QGC position on map

Pinch zoom doesn’t seem to be working for some reason

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

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

- Only show video option if supported
- Persist settings
- Show/Hide/Add items correctly

- Restructured a number of MissionItem properties as well

Plus lots of other cleanup

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

Everything is now based off of default font pixel size

It does not update anything internally. It just moves the path on the screen.

Initial rendering of Waypoints