The source project of this merge request has been removed.
catch SIGINT so we can Ctrl+C to close camera.js on the terminal
Catch SIGINT events in camera.js.
This is NOT a graceful shutdown - I'm not sure what should be done to gracefully clean up and shut down the script so for the moment this is essentially a kludge. Maybe at worst add a TODO comment to add clean-up code later if you merge this.