DisplayObjectExplorer: updated practices a bit and got rid of errors in Flash CC (closes #790)
List, GroupedList: properly removes the typical item renderer (including dispatching RENDERER_REMOVE event) when the data provider is cleared if the typical item came from the data provider (closes #799)
MetalWorksMobileTheme, MinimalMobileTheme: use custom names for slider and simple scroll bar sub-components (closes #800)