Remove deprecated classes and methods, deprecate all named constants

All named constants used inside classes have been deprecated and
must now be set from method calls, class init, etc

src/Debug/FileWriter.php

@@ -75,6 +75,11 @@ class FileWriter
 			empty(self::$debug_folder) &&
 			defined('BASE') && defined('LOG')
 		) {
+			/** @deprecated Do not use this anymore, define path with fsetFolder */
+			trigger_error(
+				'fsetFolder must be set first. Setting via LOG_FILE_ID and LOg constants is deprecated',
+				E_USER_DEPRECATED
+			);
 			self::$debug_folder = BASE . LOG;
 		}
 		if (!is_writeable(self::$debug_folder)) {