Follow-up from "Refactoring datarecorder"

The following discussion from !6 (merged) should be addressed:

• @Balzer_J started a discussion: (+1 comment)

  @A.Clement I had to change the stop mechanism again. The approach with multiple stop conditions is not easy to implement since we have blocking events in eta-utility.

  Also the keyboard works only on Windows and Linux, and on Linux you need root access to run. There are other packages that work for all platforms without root, but I think using Crtl+C is the best option here. It only stop when you type it in the terminal, whereas the keyboard module (and others) scan every keyboard input, even when in another window.