The CLI module was lacking unit test coverage and showed some severe
coding style violations, which this patch addresses.
In addition, all uses of qCritical() with untranslatble raw char*
sequences were removed in favor of proper locale strings. These are
written to STDERR through QTextStreams and support output
redirection for testing purposes. With this change, error messages don't
depend on the global Qt logging settings and targets anymore and go
directly to the terminal or into a file if needed.
This patch also fixes a bug discovered during unit test development,
where the extract command would just dump the raw XML contents without
decrypting embedded Salsa20-protected values first, making the XML
export mostly useless, since passwords are scrambled.
Lastly, all CLI commands received a dedicated -h/--help option.
The database wasn't saved properly and lockfiles were not removed when receiving the signals SIGINT, SIGTERM, SIGQUIT or SIGHUP. This patch implements signal handling and performs a clean shutdown after receiving SIGINT SIGTERM or SIGQUIT and ignores SIGHUP.
Since this uses POSIX syscalls for signal and socket handling, there is no Windows implementation at the moment.
