Clean up old (and partially unused) Aggro() function and use EnterCombat() instead + fix some minor enum-typos (INTURRUPT -> INTERRUPT)

(fix by Azazel)

--HG--
branch : trunk

src/server/scripts/EasternKingdoms/BlackwingLair/boss_victor_nefarius.cpp

@@ -292,7 +292,7 @@ struct boss_victor_nefariusAI : public ScriptedAI
                     //Teleport Victor Nefarius way out of the map
                     //sMapMgr.GetMap(me->GetMapId(), me)->CreatureRelocation(me,0,0,-5000,0);
 
-                    //Inturrupt any spell casting
+                    //Interrupt any spell casting
                     me->InterruptNonMeleeSpells(false);
 
                     //Root self