Worked on PoldiAutoCorrelation-algorithm

The PoldiAutoCorrelation-algorithm has been rewritten to correspond closely to an existing analysis software for the data. Since some hardware components of the instrument will change in the near future, their representation has been separated from the algorithm. This way it will be easier to adapt the code once the new hardware has been installed. In addition, these small components are easier to test, unit tests have been added.

Additionally, a system test has been added to make sure the algorithm works correctly. A pull request for this will follow if this set of changes is accepted, since it won't work with the old implementation.