I think the assert caused boot crashes at some times

- New mission command editor dialog
- New MissionCommands toolbox object to get command info
- Added APM mission item set

Instead us a Toolbox concept which hangs off of QGCApplication

Also merged MissionController and MissionEditorController into single
MissionController implementation

Plus lots of other tweaks to ui for visuals

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

- Delete all old map code