Extending PropertyBrowser with MaterialProperty support, part III.

GUI/coregui/Views/Components/SampleDesigner/LayerView.cpp

GUI/coregui/Views/Components/SampleDesigner/LayerView.h

...regui/Views/Components/SampleDesigner/MaterialBrowser.cpp

...coregui/Views/Components/SampleDesigner/MaterialBrowser.h

.../Views/Components/SampleDesigner/MaterialBrowserModel.cpp

...ui/Views/Components/SampleDesigner/MaterialBrowserModel.h

...i/Views/Components/SampleDesigner/MaterialBrowserView.cpp

...gui/Views/Components/SampleDesigner/MaterialBrowserView.h

GUI/coregui/Views/Components/SampleDesigner/NodeEditor.h

...Views/Components/SampleDesigner/ObjectPropertyManager.cpp

...i/Views/Components/SampleDesigner/ObjectPropertyManager.h

.../Views/Components/SampleDesigner/ObjectVariantManager.cpp

...ui/Views/Components/SampleDesigner/ObjectVariantManager.h

.../Views/Components/SampleDesigner/PropertyBrowserUtils.cpp

...ui/Views/Components/SampleDesigner/PropertyBrowserUtils.h

...iews/Components/SampleDesigner/PropertyVariantFactory.cpp

.../Views/Components/SampleDesigner/PropertyVariantFactory.h

...iews/Components/SampleDesigner/PropertyVariantManager.cpp

.../Views/Components/SampleDesigner/PropertyVariantManager.h

...oregui/Views/Components/SampleDesigner/SampleDesigner.pri