Better handle the dirty state of Airmap's flightplan

If briefing evaluation returns no authorization, assume none is required. This is reflected in the UI as "Authorization Not Required".

Handle flight start/end time
Handle start/stop traffic monitor
Only start telemetry if enabled
Added a "Now" button for the flight start time
Collect advisories only when the rules change

Implementing authorization management

Cleaning up old vehicle manager and getting it ready to actually provide services for a vehicle (flight management)
Added submit flight plan
Added update flight plan
Disable flight features as these don't seem to be quite working (values must be initialized and validated before submission as backend doesn't validate and the objects don't initialize their members)

Have different modes for the Airspace Widget (Plan/Fly)