Merging two different CorrespondenceModel concepts

[Nicolas-Boltz]

An older bachelor thesis defines another kind of correspondence model, than the one currently used and extended ProtoComin a way that a valid correspondence model is automatically being built by ProtoCom.

The current and new correspondence models need to be merged in a way to keep the ProtoCom functionality of the new and the more intuitive way of accessing the model data of the current model.