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Handle Ctrl-C (SIGINT) once gracefully

Matti Viljanen requested to merge handle-ctrl-c into master

Handle Ctrl-C when started in terminal outside Sailjail (invoker eats signals for breakfast 😞):

  • ❌ invoker --type=qt5 /usr/bin/harbour-whisperfish
  • ✅ devel-su -p /usr/bin/harbour-whisperfish
  • ✅ sudo -E -u defaultuser -g privileged harbour-whisperfish
  • ✅ harbour-whisperfish

Catches SIGINT, and tries to close Whisperfish by making a DBus call. The second time it catches SIGINT, it just exits.

This is effectively for developers only, but every forceful exit is an unwanted one.

Fixes #425 (closed)

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