rename InterferenceFunction -> Interference for consistency and brevity

CHANGELOG

Core/Contrib/ParticleLayoutContribution.cpp

Core/Export/SampleToPython.cpp

Core/Export/SampleToPython.h

Examples/fit51_Basic/minimizer_settings.py

Examples/fit53_CustomObjective/custom_objective_function.py

Examples/fit54_ExternalMinimizer/lmfit_basics.py

Examples/fit54_ExternalMinimizer/lmfit_with_plotting.py

Examples/fit61_Galaxi/sample_builder.py

Examples/scatter2d/ApproximationDA.py

Examples/scatter2d/ApproximationLMA.py

Examples/scatter2d/ApproximationSSCA.py

Examples/scatter2d/BoxesWithSpecularPeak.py

Examples/scatter2d/CoreShellNanoparticles.py

Examples/scatter2d/CosineRipplesAtRectLattice.py

Examples/scatter2d/CylindersAndPrisms.py

Examples/scatter2d/CylindersInAverageLayer.py

Examples/scatter2d/HalfSpheresInAverageTopLayer.py

Examples/scatter2d/HexagonalLatticesWithBasis.py

Examples/scatter2d/Interference1DRadialParaCrystal.py