Add warning if connected to aircraft and try to quit fgcs

[ProgramPhantom]

[ProgramPhantom]

The best way to handle Modal open/close is to store the state in redux. That way the toolbar component can open the Modal and it can handle it's own closure - without having to pass props.

This data does not fit particularly well into any of the current application slices, so a new "application" slice will be created to hold generic application data.