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/Kalimdor/Maraudon/boss_noxxion.cpp

@@ -96,7 +96,7 @@ struct boss_noxxionAI : public ScriptedAI
         //Adds_Timer
         if (!Invisible && Adds_Timer <= diff)
         {
-            //Inturrupt any spell casting
+            //Interrupt any spell casting
             //me->m_canMove = true;
             me->InterruptNonMeleeSpells(false);
             me->setFaction(35);

src/server/scripts/Kalimdor/ashenvale.cpp

@@ -325,7 +325,7 @@ struct npc_muglashAI : public npc_escortAI
         }
     }
 
-    void Aggro(Unit* /*pWho*/)
+    void EnterCombat(Unit* /*pWho*/)
     {
         if (HasEscortState(STATE_ESCORT_PAUSED))
         {

src/server/scripts/Kalimdor/the_barrens.cpp

@@ -125,7 +125,7 @@ struct npc_giltharesAI : public npc_escortAI
         }
     }
 
-    void Aggro(Unit* pWho)
+    void EnterCombat(Unit* pWho)
     {
         //not always use
         if (rand()%4)