when inputs are of Integer type, like in the conceptual domain for level 
2 and higher models

across packages

so we can use fit_predict! or fit_transform! instead of doing both 
separately

without an unnecessary one-hot encoding in the middle

Uses new form now and should work as intended

Deleted the old Krippendorff implementation from the main branch. A backup is still available in the Krippendorff-Archive branch

sorry for the squashed commit, this marks the version that was used to 
generate nearly all figures in the final master thesis