[bisq-network/bisq] Added graceful shutdown hook (#4047)

[Florian Reimair]

@freimair pushed 6 commits.

8bab25ac177b7b56863e2eecb4f4a83b02955e42  Make sure to shut down tor
0bbb8e69523eac6fe77906d45683ccc1b6ac8b1d  Harmonize System::exit usage
0fb4f13319351bdf81de0619d22b414e4fef5b24  Fix closing the app by gui exit
c588b19074856d4b29f9b9e48a82c07103912349  Log output shows graceful shutdown message
4ff4801e5c296109917448eabec03b8e3cfb0ef8  Cleanup logging
50ba2cd74050a36d33115fc540a09d1ccd985592  Only send message bundle if not stopped


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View it on GitHub:
https://github.com/bisq-network/bisq/pull/4047/files/2e7483dff63d77ecc1f8bcf6afc1143db0a7a285..50ba2cd74050a36d33115fc540a09d1ccd985592
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