code: protected function initialize()
  	{
  		if (static::$blnHasLcf === null)
  		{
  			static::preload();
  		}
  
  		$strCacheDir = System::getContainer()->getParameter('kernel.cache_dir');
  
  		if (file_exists($strCacheDir . '/contao/config/config.php'))
  		{
  			include $strCacheDir . '/contao/config/config.php';
  		}
  		else
  		{
  			try
  			{
  				$files = System::getContainer()->get('contao.resource_locator')->locate('config/config.php', null, false);
  			}
  			catch (\InvalidArgumentException $e)
  			{
  				$files = array();
  			}
  
  			foreach ($files as $file)
  			{
  				include $file;
  			}
  		}
  
  		// Include the local configuration file again
  		if (static::$blnHasLcf)
  		{
  			include $this->strRootDir . '/system/config/localconfig.php';
  		}
  
  		static::loadParameters();
  	}
docs: Load all configuration files