Dynamic config loading

- Move settings, defaults and dbstructure to directory 'static'
- Dynamic loading of config files (after the static loading)
- Filter out '-sample.config.php' and '-sample.ini.php' files
- Remove unnecessary ConfigFileManager
- Move ConfigFileLoader to Utils
- Add tests for multi-loading for INI, config and sample-filtering

tests/include/ApiTest.php

@@ -14,6 +14,7 @@ use Friendica\Core\System;
 use Friendica\Factory;
 use Friendica\Network\HTTPException;
 use Friendica\Util\BaseURL;
+use Friendica\Util\ConfigFileLoader;
 use Monolog\Handler\TestHandler;
 
 require_once __DIR__ . '/../../include/api.php';