Align IDS Policy Language with DPV

[JohannesLipp]

Please align the IDS policy language (where possible) with subclasses of dpv:Processing.

(See https://dpvcg.github.io/dpv/#vocab-processing-categories – there is, e.g., https://dpvcg.github.io/dpv/#Anonymise and https://dpvcg.github.io/dpv/#PseudoAnonymise. But, OK, strictly spoken, these are not, like in IDS, states, but operations ("The processing performed on personal data"), which lead into a state. Nevertheless, aligning (at the very least by rdfs:seeAlso) makes sense. (Issue proposed by @clange )