Merge branch 'gui_basis' into develop

GUI/coregui/Models/DomainObjectBuilder.cpp

GUI/coregui/Models/DomainObjectBuilder.h

GUI/coregui/Models/GUIObjectBuilder.cpp

GUI/coregui/Models/GUIObjectBuilder.h

GUI/coregui/Models/ItemFactory.cpp

GUI/coregui/Models/ParticleCollectionItem.cpp

GUI/coregui/Models/ParticleCollectionItem.h

GUI/coregui/Models/ParticleCoreShellItem.cpp

GUI/coregui/Models/ParticleLayoutItem.cpp

GUI/coregui/Models/SampleValidator.cpp

GUI/coregui/Models/TransformToDomain.cpp

GUI/coregui/Models/TransformToDomain.h

GUI/coregui/Models/item_constants.h

GUI/coregui/Views/SampleDesigner/ParticleCollectionView.cpp

GUI/coregui/Views/SampleDesigner/ParticleCollectionView.h

GUI/coregui/Views/SampleDesigner/SampleViewFactory.cpp

GUI/coregui/Views/widgetbox/widgetbox.xml