CodeIgniter 3.1.11 -> 3.4.5 (pocketarc fork) en PHP 8.3-fixes

- system/ vervangen door CodeIgniter 3.4.5 (pocketarc/codeigniter, PHP 8.2-8.5 compatibel)
- config.php, mimes.php, user_agents.php en error-views bijgewerkt naar 3.4.5
- composer.json: php-constraint "^7.4 || ^8.0" zodat composer install op 8.3 werkt
- PHP 8-fatals opgelost: count()/array-functies op FALSE/null, rekenen met lege
  strings, delen door nul, property zetten op FALSE, curly-brace string offsets,
  ongedefinieerde constanten, foute curl_setopt in Phantom_model::create_img
- dynamic properties gedeclareerd in libraries, optionele parameters voor verplichte opgelost
- vergelijkingen waar '' == 0 in PHP 8 anders uitvalt gecast naar (int)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

system/libraries/Javascript.php

@@ -6,7 +6,7 @@
  *
  * This content is released under the MIT License (MIT)
  *
- * Copyright (c) 2014 - 2019, British Columbia Institute of Technology
+ * Copyright (c) 2014 - 2016, British Columbia Institute of Technology
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -29,7 +29,7 @@
  * @package	CodeIgniter
  * @author	EllisLab Dev Team
  * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
- * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (http://bcit.ca/)
+ * @copyright	Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)
  * @license	http://opensource.org/licenses/MIT	MIT License
  * @link	https://codeigniter.com
  * @since	Version 1.0.0
@@ -49,6 +49,20 @@ defined('BASEPATH') OR exit('No direct script access allowed');
  */
 class CI_Javascript {
 
+	/**
+	 * CI Singleton
+	 *
+	 * @var	object
+	 */
+	protected $CI;
+
+	/**
+	 * JavaScript library driver instance
+	 *
+	 * @var	object
+	 */
+	public $js;
+
 	/**
 	 * JavaScript location
 	 *
@@ -650,11 +664,11 @@ class CI_Javascript {
 			$this->_javascript_location = $this->CI->config->item('javascript_location');
 		}
 
-		if ($relative === TRUE OR strpos($external_file, 'http://') === 0 OR strpos($external_file, 'https://') === 0)
+		if ($relative === TRUE OR stripos($external_file, 'http://') === 0 OR stripos($external_file, 'https://') === 0)
 		{
 			$str = $this->_open_script($external_file);
 		}
-		elseif (strpos($this->_javascript_location, 'http://') !== FALSE)
+		elseif (stripos($this->_javascript_location, 'http://') !== FALSE)
 		{
 			$str = $this->_open_script($this->_javascript_location.$external_file);
 		}