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 />