Draft: Packaging

This adds all necessary files to import the code into another python project.

The class CampbellParser is an example for a MQTT Parser, it should be improved when dealing with real MQTT data sources.

There is a redundancy in the 'install_requires' in setup.py and the requirements.txt under src. This is on one side intended as it gives the option to have different minimum requirements. On the other side, there is no use at the moment. I will think over this.