Flight logging/snapshots

[alexanderson1993]

This line was in the Architecture.md file:

Flights also contain a list of all of the game inputs which happened during the flight, along with the timestamp and game tick in which they happened. This should make it possible to replay events of the flight, or rewind a certain amount of time by replaying events.

There are two similar but distinct aspects to this:

• Provide a snapshot of the flight, kind of like a autosave. Include a timeline action which can trigger an autosave when the crew gets to an important moment.
• Log all of the inputs to a flight for later analysis. This should be an option used when starting a flight.