GroupProperty renamed to GroupItemController

GUI/coregui/Models/GroupItem.cpp

GUI/coregui/Models/GroupItem.h

GUI/coregui/Models/GroupItemController.cpp

GUI/coregui/Models/GroupItemController.h

GUI/coregui/Models/GroupPropertyRegistry.h

GUI/coregui/Models/SessionModelDelegate.h

GUI/coregui/Models/SessionXML.cpp

GUI/coregui/Views/PropertyEditor/CustomEditors.cpp

GUI/coregui/Views/PropertyEditor/ObsoleteComponentEditor.cpp

...regui/Views/PropertyEditor/ObsoletePropertyBrowserUtils.h

...gui/Views/PropertyEditor/ObsoletePropertyVariantFactory.h

...gui/Views/PropertyEditor/ObsoletePropertyVariantManager.h

GUI/coregui/Views/PropertyEditor/PropertyEditorFactory.cpp

GUI/coregui/Views/SampleDesigner/ParticleView.cpp

Tests/UnitTests/GUI/TestParaCrystalItems.h