upgrade smarty lib; use composer; increase php version and plugin version

cl_plugin.xml

@@ -10,9 +10,9 @@
         <mail>info@php-backoffice.de</mail>
         <website>http://php-backoffice.de</website>
         <version>1.1.0</version>
-        <license>GNU Lesser General Public License</license>
+        <license>GPL-3.0-or-later</license>
     </general>
-    <requirements php="8.2">
+    <requirements php="8.0">
         <conlite minversion="2.9.0" />
     </requirements>
     <conlite />

classes/class.smarty.wrapper.php

@@ -23,7 +23,7 @@
  */
 defined('CON_FRAMEWORK') || die('Illegal call: Missing framework initialization - request aborted.');
 
-class cSmartyWrapper extends Smarty {
+class cSmartyWrapper extends Smarty\Smarty {
 
     public function fetch($template = NULL, $cache_id = NULL, $compile_id = NULL, $parent = NULL, $display = false, $merge_tpl_vars = true, $no_output_filter = false) {
         /* @todo implement functionality for CL 2.0

composer.json

@@ -0,0 +1,16 @@
+{
+  "name": "conlite/plugin_smarty",
+  "description": "Enhance Backend and Frontend of ConLite with Smarty Template Engine",
+  "minimum-stability": "stable",
+  "license": "GPL-3.0-or-later",
+  "authors": [
+    {
+      "name": "Ortwin Pinke",
+      "email": "o.pinke@conlite.de"
+    }
+  ],
+  "require": {
+    "php": ">=8.0",
+    "smarty/smarty": "v5.5.*"
+  }
+}

includes/config.plugin.php

@@ -5,30 +5,20 @@ global $load_client;
  *
  * @package Plugin
  * @subpackage SmartyWrapper
- * @version $Rev: 128 $
- * @since 2.0.2
+ * @since 3.0.0
  * @author Ortwin Pinke <o.pinke@conlite.org>
- * @copyright (c) 2018, conlite.org
+ * @copyright (c) 2018 - 2025, conlite.org
  * @license http://www.gnu.de/documents/gpl.en.html GPL v3 (english version)
  * @license http://www.gnu.de/documents/gpl.de.html GPL v3 (deutsche Version)
  * @link http://www.conlite.org ConLite.org
- * 
- * $Id: config.plugin.php 128 2019-07-03 11:58:28Z oldperl $
  */
 
 defined('CON_FRAMEWORK') || die('Illegal call: Missing framework initialization - request aborted.');
 
 rereadClients();
 $client = (isset($client)) ? $client : $load_client;
-// Load smarty
-if (!defined('SMARTY_DIR')) {
-    define('SMARTY_DIR', cRegistry::getConfigValue('path', 'conlite') 
-            .  cRegistry::getConfigValue('path', 'plugins')
-            . 'smarty/libs/');
-}
 
-require_once(SMARTY_DIR . 'Autoloader.php');
-Smarty_Autoloader::register();
+require_once dirname(__FILE__, 2) . '/vendor/autoload.php';
 
 try {
     new cSmartyFrontend(cRegistry::getConfig(), cRegistry::getClientConfig(cRegistry::getClientId()), true);