Core/Logging: Minor changes

- Select stderr when writing ERROR and FATAL messages
- Simplify function defines
- Fix `logs` table structure with latest logging changes

sql/base/auth_database.sql

@@ -224,7 +224,7 @@ DROP TABLE IF EXISTS `logs`;
 CREATE TABLE `logs` (
   `time` int(10) unsigned NOT NULL,
   `realm` int(10) unsigned NOT NULL,
-  `type` tinyint(3) unsigned NOT NULL,
+  `type` varchar(250),
   `level` tinyint(3) unsigned NOT NULL DEFAULT '0',
   `string` text CHARACTER SET latin1
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;