[j.823m] numerous renamings for clearer layering of GUI/View ()

App/main.cpp

GUI/CMakeLists.txt

GUI/Model/Beam/DistributionItemCatalog.h

GUI/Model/Beam/FootprintItemCatalog.h

GUI/Model/Data/Data2DItem.cpp

GUI/Model/Detector/ResolutionFunctionItemCatalog.h

GUI/Model/Device/BackgroundItemCatalog.h

GUI/Model/Device/InstrumentItemCatalog.h

GUI/Model/Mask/MaskItemCatalog.h

GUI/Model/Sample/CoreAndShellItem.cpp

GUI/Model/Sample/FormFactorItemCatalog.cpp

GUI/Model/Sample/FormFactorItemCatalog.h

GUI/Model/Sample/InterferenceItemCatalog.cpp

GUI/Model/Sample/InterferenceItemCatalog.h

GUI/Model/Sample/ItemWithParticlesCatalog.cpp

GUI/Model/Sample/ItemWithParticlesCatalog.h

GUI/Model/Sample/Lattice2DItemCatalog.h

GUI/Model/Sample/ProfileItemCatalogs.h

GUI/Model/Sample/RotationItemCatalog.h

GUI/Model/Sample/RoughnessItemCatalog.h