Initialize the plugin.
$view: The view object.
$display: The display handler.
public function init(ViewExecutable $view, &$display, $options = NULL) {
$this
->setOptionDefaults($this->options, $this
->defineOptions());
$this->view =& $view;
$this->displayHandler =& $display;
$this
->unpackOptions($this->options, $options);
}