[WIP] Core/AI: Pets musn't attack civilian NPC in aggressive mode

Port From (https://github.com/TrinityCore/TrinityCore/commit/1e932109996a0ce2117f3d5268064ee882267e84)

Source/Game/Maps/GridNotifiers.cs

@@ -2246,10 +2246,11 @@ namespace Game.Maps
 
     class NearestHostileUnitInAggroRangeCheck : ICheck<Unit>
     {
-        public NearestHostileUnitInAggroRangeCheck(Creature creature, bool useLOS = false)
+        public NearestHostileUnitInAggroRangeCheck(Creature creature, bool useLOS = false, bool ignoreCivilians = false)
         {
             _me = creature;
             _useLOS = useLOS;
+            _ignoreCivilians = ignoreCivilians;
         }
 
         public bool Invoke(Unit u)
@@ -2266,11 +2267,21 @@ namespace Game.Maps
             if (_useLOS && !u.IsWithinLOSInMap(_me))
                 return false;
 
+            // pets in aggressive do not attack civilians
+            if (_ignoreCivilians)
+            {
+                Creature c = u.ToCreature();
+                if (c != null)
+                    if (c.IsCivilian())
+                        return false;
+            }
+
             return true;
         }
 
         Creature _me;
         bool _useLOS;
+        bool _ignoreCivilians;
     }
 
     class AnyAssistCreatureInRangeCheck : ICheck<Creature>