Merge branch 'reorg_dirs' into 'develop'

GUI/Models/ApplicationModels.cpp

GUI/Models/ComponentProxyStrategy.cpp

GUI/Models/ComponentUtils.cpp

GUI/Models/ComponentUtils.h

GUI/Models/IntensityDataItem.cpp

GUI/Models/MaterialItemUtils.cpp

GUI/Models/SpecularDataItem.cpp

GUI/Views/FitWidgets/FitParameterWidget.cpp

GUI/Views/PropertyEditor/ComponentFlatView.cpp

GUI/Views/PropertyEditor/ComponentTreeView.cpp

GUI/Views/PropertyEditor/PropertyWidgetItem.cpp

GUI/Views/PropertyEditor/TestComponentView.cpp

GUI/Views/SessionModelDelegate.cpp

GUI/Views/SessionModelDelegate.h

GUI/Views/SessionModelView.cpp

Tests/UnitTests/GUI/TestComponentUtils.cpp