[IMPROVE] Print statements

[CoMPaTech]

Describe the improvement
Rewrite print-statements to _LOGGER statements

From findings during #24

[CoMPaTech]

@brefra can you have a look at the if self.print_progress: then print statements in stick.py? First glance as @bouwew mentioned they might just become _LOGGER.debug statements, having said that - probably just using _LOGGER.debug might also skip all the if-statement.

[brefra]

All print statements are leftovers from the early days for use the lib standalone directly from cli. Not really an usecase anymore.
I'll prepare a PR to get them removed.