list_devices: adds support for several com ports

…2 session were not terminated properly due to garbage data coming along with the metadata. We now expect them and try to get metadata one more time, but this time without garbage from previous session

Added example to reproduce/showcase error and fix. This examples should also just work after connecting to a PPK2 via USB

Empty buffer on ppk2 init, remove retries on metadata as it was rather treating the symptom instead of the root cause

Add retries on connection as a bad exit can cause the serial port to not be immidiatly discovered

Remove logging and raise exceptions instead. Calling logger.*(message) messes up with higher level application loggers. The application using the ppk2 lib should decide what to do with the exceptions and thereby log what they need.

Fixed borken api call in power_profiler.py

Harden API by adding types to functions

cleanup import

Fixed issue where metadata would come with garbage