label.go
func NewLabel(w *Window, x, y int) (Widgeter, error) {
	return &Label{
		Widget: MakeWidget(w, x, y),
	}, nil
}
func NewLabel(w *Window, x, y int) (Widgeter, error) {
	return &Label{
		Widget: MakeWidget(w, x, y),
	}, nil
}
// NewLabel is the Label initializer.  This call implements the NewWidget
// convention by taking a *Window and and an anchor point to render the widget.