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/console/Application.php

@@ -87,7 +87,7 @@ class Application implements ResetInterface
     private string $defaultCommand;
     private bool $singleCommand = false;
     private bool $initialized = false;
-    private SignalRegistry $signalRegistry;
+    private ?SignalRegistry $signalRegistry = null;
     private array $signalsToDispatchEvent = [];
 
     public function __construct(string $name = 'UNKNOWN', string $version = 'UNKNOWN')