[FIX] Smarty modifier "d": Class "Kint\Parser\Plugin" not found | Adaptation for Kint v5.1.0

When using the smarty modifier "d", the class Kint\Parser\Plugin is missing which throws the bellow error. This is due to the fact that the commit rodriguezny/tiki@5a3d17ea upgraded the packge Kint from v4.2.3 to v5.1.0 without adapting the code implementing Kint usage to new version. In Kint v5.1.0 the missing class has been converted to an interface which required to update the SmartyKint class to implement the interface \Kint\Parser\PluginInterface.