Core/SmartAI: Add a spellid to SMART_EVENT_TARGET_CASTING. If left on 0, it checks for all spells (like it did without these changes)

src/server/game/AI/SmartScripts/SmartScriptMgr.h

@@ -94,7 +94,7 @@ enum SMART_EVENT
     SMART_EVENT_OOC_LOS                  = 10,      // NoHostile, MaxRnage, CooldownMin, CooldownMax
     SMART_EVENT_RESPAWN                  = 11,      // type, MapId, ZoneId
     SMART_EVENT_TARGET_HEALTH_PCT        = 12,      // HPMin%, HPMax%, RepeatMin, RepeatMax
-    SMART_EVENT_TARGET_CASTING           = 13,      // RepeatMin, RepeatMax
+    SMART_EVENT_TARGET_CASTING           = 13,      // RepeatMin, RepeatMax, spellid
     SMART_EVENT_FRIENDLY_HEALTH          = 14,      // HPDeficit, Radius, RepeatMin, RepeatMax
     SMART_EVENT_FRIENDLY_IS_CC           = 15,      // Radius, RepeatMin, RepeatMax
     SMART_EVENT_FRIENDLY_MISSING_BUFF    = 16,      // SpellId, Radius, RepeatMin, RepeatMax
@@ -213,13 +213,20 @@ struct SmartEvent
             uint32 repeatMax;
         } minMax;
 
+        struct
+        {
+            uint32 repeatMin;
+            uint32 repeatMax;
+            uint32 spellId;
+        } targetCasting;
+
         struct
         {
             uint32 hpDeficit;
             uint32 radius;
             uint32 repeatMin;
             uint32 repeatMax;
-        } friendlyHealt;
+        } friendlyHealth;
 
         struct
         {
@@ -368,7 +375,7 @@ struct SmartEvent
             uint32 maxHpPct;
             uint32 repeatMin;
             uint32 repeatMax;
-        } friendlyHealtPct;
+        } friendlyHealthPct;
 
         struct
         {