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

Also show QGC position on map

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.

It was kind of big...

Also merged MissionController and MissionEditorController into single
MissionController implementation

Mostly accomplished by delay loading Qml elements

- Follow Vehicle
- Center map on vehicle

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

- Restructured a number of MissionItem properties as well