Refactor implementation of structure factor calculations

Core/Aggregate/IInterferenceFunction.cpp

Core/Aggregate/IInterferenceFunction.h

Core/Aggregate/InterferenceFunction1DLattice.cpp

Core/Aggregate/InterferenceFunction1DLattice.h

Core/Aggregate/InterferenceFunction2DLattice.cpp

Core/Aggregate/InterferenceFunction2DLattice.h

Core/Aggregate/InterferenceFunction2DParaCrystal.cpp

Core/Aggregate/InterferenceFunction2DParaCrystal.h

Core/Aggregate/InterferenceFunction2DSuperLattice.cpp

Core/Aggregate/InterferenceFunction2DSuperLattice.h

Core/Aggregate/InterferenceFunction3DLattice.cpp

Core/Aggregate/InterferenceFunction3DLattice.h

Core/Aggregate/InterferenceFunctionFinite2DLattice.cpp

Core/Aggregate/InterferenceFunctionFinite2DLattice.h

Core/Aggregate/InterferenceFunctionFinite3DLattice.cpp

Core/Aggregate/InterferenceFunctionFinite3DLattice.h

Core/Aggregate/InterferenceFunctionNone.cpp

Core/Aggregate/InterferenceFunctionNone.h

Core/Aggregate/InterferenceFunctionRadialParaCrystal.cpp

Core/Aggregate/InterferenceFunctionRadialParaCrystal.h