Unify output stream handling

[bkircher]

Sometimes we print with fmt. and sometimes it is log.. Maybe redirect to whatever cobra offers here. Anyway, kind of in-transparent. Clean this up.

[JanLukasGithub]

The problem is that there are two different types of output: logging and user output. When fmt. is used, it's for data like object uuids and such, and when log. is used, it's for logging/informational messages. The logging library doesn't support important parts of data output like printing regardless of logging level, and fmt doesn't support important logging features like logging levels