Code Clean up, more testing

Remove unused code and classes.
Clean up code to remove all named constant from them and throw
deprecation alerts if used.
Add basic psalm setup in root folder and remove from www folder

vendor/symfony/service-contracts/ServiceSubscriberTrait.php

@@ -66,12 +66,13 @@ trait ServiceSubscriberTrait
     #[Required]
     public function setContainer(ContainerInterface $container): ?ContainerInterface
     {
-        $this->container = $container;
-
+        $ret = null;
         if (method_exists(get_parent_class(self::class) ?: '', __FUNCTION__)) {
-            return parent::setContainer($container);
+            $ret = parent::setContainer($container);
         }
 
-        return null;
+        $this->container = $container;
+
+        return $ret;
     }
 }