USelection::IsSelected

Hide [IsSelected()](API\Editor\UnrealEd\USelection\IsSelected\2), as calling [IsSelected()](API\Editor\UnrealEd\USelection\IsSelected\2) on a selection set almost always indicates an error where the caller should use [IsSelected(UObject* InObject)](API\Developer\TraceInsights\Insights\ViewModels\ETimingTrackFlags).