Core/AI: UnitAI trimming part two. WaypointX methods kicked upstairs to CreatureAI

Port From (https://github.com/TrinityCore/TrinityCore/commit/e0afca513a9bfbd82134942e1266e46811707cbb)

Source/Game/AI/CoreAI/CreatureAI.cs

@@ -500,6 +500,16 @@ namespace Game.AI
         }
         public virtual void QuestReward(Player player, Quest quest, LootItemType type, uint opt) { }
 
+        /// == Waypoints system =============================
+
+        public virtual void WaypointPathStarted(uint pathId) { }
+
+        public virtual void WaypointStarted(uint nodeId, uint pathId) { }
+
+        public virtual void WaypointReached(uint nodeId, uint pathId) { }
+
+        public virtual void WaypointPathEnded(uint nodeId, uint pathId) { }
+
         public virtual void PassengerBoarded(Unit passenger, sbyte seatId, bool apply) { }
 
         public virtual void OnSpellClick(Unit clicker, ref bool result) { }

Source/Game/AI/CoreAI/UnitAI.cs

@@ -496,14 +496,6 @@ namespace Game.AI
         /// </summary>
         public virtual void OnGameEvent(bool start, ushort eventId) { }
 
-        public virtual void WaypointPathStarted(uint nodeId, uint pathId) { }
-
-        public virtual void WaypointStarted(uint nodeId, uint pathId) { }
-
-        public virtual void WaypointReached(uint nodeId, uint pathId) { }
-
-        public virtual void WaypointPathEnded(uint nodeId, uint pathId) { }
-
         public static AISpellInfoType GetAISpellInfo(uint spellId, Difficulty difficulty)
         {
             return _aiSpellInfo.LookupByKey((spellId, difficulty));

Source/Game/AI/SmartScripts/SmartAI.cs

@@ -390,11 +390,12 @@ namespace Game.AI
             return true;
         }
 
-        public override void WaypointPathStarted(uint nodeId, uint pathId)
+        public override void WaypointPathStarted(uint pathId)
         {
             if (!HasEscortState(SmartEscortState.Escorting))
             {
-                GetScript().ProcessEventsFor(SmartEvents.WaypointStart, null, nodeId, pathId);
+                // @todo remove the constant 1 at some point, it's never anything different
+                GetScript().ProcessEventsFor(SmartEvents.WaypointStart, null, 1, pathId);
                 return;
             }
         }

Source/Game/Movement/Generators/WaypointMovement.cs

@@ -59,8 +59,8 @@ namespace Game.Movement
             _nextMoveTime.Reset(1000);
 
             // inform AI
-            if (creature.GetAI() != null)
-                creature.GetAI().WaypointPathStarted(1, _path.id);
+            if (creature.IsAIEnabled)
+                creature.GetAI().WaypointPathStarted(_path.id);
         }
 
         public override void DoInitialize(Creature creature)