Core: Updated to 6.2.4

* Rewrite bnetserver for new authentication protocol

sql/updates/auth/2016_03_28_00_auth.sql

@@ -0,0 +1,21 @@
+DROP TABLE IF EXISTS `battlenet_components`;
+DROP TABLE IF EXISTS `battlenet_modules`;
+
+DROP TABLE IF EXISTS `account_last_played_character`;
+CREATE TABLE `account_last_played_character` (
+  `accountId` int(10) unsigned NOT NULL,
+  `region` tinyint(3) unsigned NOT NULL,
+  `battlegroup` tinyint(3) unsigned NOT NULL,
+  `realmId` int(10) unsigned,
+  `characterName` varchar(12),
+  `characterGUID` bigint(20) unsigned,
+  `lastPlayedTime` int(10) unsigned,
+  PRIMARY KEY(`accountId`,`region`,`battlegroup`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+ALTER TABLE `battlenet_accounts`
+  DROP `s`,
+  DROP `v`,
+  DROP `sessionKey`;
+
+UPDATE `realmlist` SET `gamebuild`=21355 WHERE `gamebuild`=20726;