- Defined some packages as optional now

src/Lean.php

@@ -133,17 +133,17 @@ class Lean
         $path = dirname(__DIR__) . "/meta/definitions/";
 
         return array_merge(
-            require($path . "cli.php"),
-            require($path . "cronard.php"),
+            class_exists(\Mcnd\CLI\Middleware::class) ? require($path . "cli.php") : [],
+            class_exists(\Cronard\CronardMiddleware::class) ? require($path . "cronard.php") : [],
             require($path . "email.php"),
             require($path . "event.php"),
             require($path . "http.php"),
             require($path . "language.php"),
-            require($path . "negundo.php"),
+            class_exists(\Negundo\Client\NegundoMiddleware::class) ? require($path . "negundo.php") : [],
             require($path . "routes.php"),
             # require($path . "security.php"),
             require($path . "software.php"),
-            require($path . "template.php"),
+            class_exists(\Picea\Picea::class) ?  require($path . "template.php") : [],
         );
     }
 }