Smarty v5 update test, initial code setup

src/BlockHandler/BlockPluginWrapper.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Smarty\BlockHandler;
+
+use Smarty\Template;
+
+class BlockPluginWrapper extends Base {
+
+	private $callback;
+
+	public function __construct($callback, bool $cacheable = true) {
+		$this->callback = $callback;
+		$this->cacheable = $cacheable;
+	}
+
+	public function handle($params, $content, Template $template, &$repeat) {
+		return call_user_func_array($this->callback, [$params, $content, &$template, &$repeat]);
+	}
+}