Rafactor model: Rename some functions to be consistent with other names

t.knopffrequested to merge
refactor_model into develop

During the overhaul of the instrument view it was noticed that some member functions have a different way of being named than others. This MR renames two functions so that they are more consistent with other function names: in SpecularBeamItem currentInclinationAxisItem becomes inclinationAxis and currentFootprintItem becomes footprint.

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