06-29 Docker and Unit Testing

The whole docker setup and configuration of services works now and is tested on Raspbian Buster, Debian Buster, Manjaro Linux and Windows 10. There are no more open issues with this. I spent quite some time messing around with the ports configuration and with fixing the folder permissions for everything. The most up to date installation guide is in README file.

In a next step before work is continued on Kalman Filtering and positioning, I started writing unit tests to make sure that everything still works when new features are added and classes are refactored. Technically speaking it is wrong to write the tests after the code, but I think having a test is better than not having a test at this point.