fix: consider out option also when passed to programmatic interface, fixes #42

[sportsracer]

The --out option previously only worked from the CLI, but not when invoking the init function programmatically. Reported as issue #42

This PR moves some code from the executable to the lib folder, and changes the behavior of init to output files if either the out or files argument are present.

I think I preserved the original behavior of the executable …

[RSeidelsohn]

Thank you so much for your contribution! I approve this, but I kindly ask you to resolve the merge conflicts, if possible. Thanks a lot!