better naming

GUI/Model/Job/JobModelFunctions.cpp

GUI/Model/Material/MaterialItem.cpp

GUI/Model/Material/MaterialItem.h

GUI/Model/Material/MaterialModel.cpp

GUI/Model/Sample/ItemWithMaterial.cpp

GUI/Model/Sample/ItemWithMaterial.h

GUI/Model/Sample/ParticleItem.cpp

GUI/Model/To/ToDomain.cpp

GUI/View/MaterialEditor/MaterialEditorDialog.cpp

GUI/View/MaterialEditor/MaterialEditorModel.cpp

GUI/View/SampleDesigner/MaterialInplaceForm.cpp

Tests/Unit/GUI/TestMaterialModel.cpp