CI4 4.3.1 upgrade

- add missing files
- overwrite changed files
- merge code changes
- Matched .htaccess file in /public/ to CI4
- Corrected naming of Error language file to Errors
- Refactored references to Error language file

app/Controllers/BaseController.php

@@ -37,6 +37,12 @@ abstract class BaseController extends Controller
      */
     protected $helpers = [];
 
+    /**
+     * Be sure to declare properties for any property fetch you initialized.
+     * The creation of dynamic property is deprecated in PHP 8.2.
+     */
+    // protected $session;
+
     /**
      * Constructor.
      */