New DeprecatedHelper namespace

For temporary wrapper functions for deprecated calls that need this

PHP 8.4 fputcsv/fgetcsv/str_getcsv encoding default change deprecated warning

Note this does not cover the SqlFileInfo class as this is not used in our code

www/admin/class_test.php

@@ -141,6 +141,7 @@ $test_files = [
 	'class_test.error_msg.php' => 'Class Test: ERROR MSG',
 	'class_test.url-requests.curl.php' => 'Class Test: URL REQUESTS: CURL',
 	'subfolder/class_test.config.direct.php' => 'Class Test: CONFIG DIRECT SUB',
+	'class_test.deprecated.helper.php' => 'Class Test: DEPRECATED HELPERS',
 ];
 
 asort($test_files);