Scripts/MagistersTerrace: reworked InstanceScript and fixed some issues on boss Vexallus

* removed old hacks and added missing auras
* Vexallus converted to EventMap

sql/updates/world/2014_06_26_02_world_misc.sql

@@ -0,0 +1,7 @@
+-- Pure Energy
+SET @ENTRY := 24745;
+UPDATE `creature_template` SET `flags_extra`=0 WHERE `entry`=@ENTRY;
+
+DELETE FROM `creature_template_addon` WHERE `entry`=@ENTRY;
+INSERT INTO `creature_template_addon` (`entry`, `mount`, `bytes1`, `bytes2`, `auras`) VALUES
+(@ENTRY, 0, 0x0, 0x0, '44326 46156');