Improve structure of the code and update to python3

[gutjuri]

I updated the structure of the code. We now have less code duplication and all configuration/parameters are in benchmark/LogSettings.py. I think this has the advantage that the project is now easier to extend with other data sets or log parsers.

I also updated the code, so now it is runnable with python3.

If you request any changes, please let me know:)