Use CommandLine.execute() and return exit code #287
Merged
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Fixes #286
See https://picocli.info/#_exit_code, this should allow the application to return a meaningful exit code on success or failure
Without this PR
should display the usage but return a
0exit code. With this PR included, the same command should return a2exit code indicating failure.