Core/Units: Added Unit::SetFacingToPoint function

Port From (https://github.com/TrinityCore/TrinityCore/commit/cdc09d29bc8fcb85d97846027ddf589478e21139)

Source/Game/Entities/Unit/Unit.Movement.cs

@@ -218,6 +218,23 @@ namespace Game.Entities
             init.Launch();
         }
 
+        void SetFacingToPoint(Position point, bool force = true)
+        {
+            // do not face when already moving
+            if (!force && (!IsStopped() || !MoveSpline.Finalized()))
+                return;
+
+            /// @todo figure out under what conditions creature will move towards object instead of facing it where it currently is.
+            MoveSplineInit init = new(this);
+            init.MoveTo(GetPositionX(), GetPositionY(), GetPositionZ(), false);
+            if (GetTransport() != null)
+                init.DisableTransportPathTransformations(); // It makes no sense to target global orientation
+            init.SetFacing(point.GetPositionX(), point.GetPositionY(), point.GetPositionZ());
+
+            //GetMotionMaster()->LaunchMoveSpline(std::move(init), EVENT_FACE, MOTION_PRIORITY_HIGHEST);
+            init.Launch();
+        }
+        
         public void MonsterMoveWithSpeed(float x, float y, float z, float speed, bool generatePath = false, bool forceDestination = false)
         {
             var initializer = (MoveSplineInit init) =>

Source/Game/Movement/MoveSplineInit.cs

@@ -196,6 +196,19 @@ namespace Game.Movement
             unit.SendMessageToSet(packet, true);
         }
 
+        public void SetFacing(Vector3 spot)
+        {
+            TransportPathTransform transform = new(unit, args.TransformForTransport);
+            Vector3 finalSpot = transform.Calc(spot);
+            args.facing.f = new Vector3(finalSpot.X, finalSpot.Y, finalSpot.Z);
+            args.facing.type = MonsterMoveType.FacingSpot;
+        }
+        
+        public void SetFacing(float x, float y, float z)
+        {
+            SetFacing(new Vector3(x, y, z));
+        }
+
         public void SetFacing(Unit target)
         {
             args.facing.angle = unit.GetAbsoluteAngle(target);
@@ -309,14 +322,6 @@ namespace Game.Movement
             args.flags.EnableAnimation();
         }
 
-        public void SetFacing(Vector3 spot)
-        {
-            TransportPathTransform transform = new(unit, args.TransformForTransport);
-            Vector3 finalSpot = transform.Calc(spot);
-            args.facing.f = new Vector3(finalSpot.X, finalSpot.Y, finalSpot.Z);
-            args.facing.type = MonsterMoveType.FacingSpot;
-        }
-
         public void DisableTransportPathTransformations() { args.TransformForTransport = false; }
 
         public void SetSpellEffectExtraData(SpellEffectExtraData spellEffectExtraData)
@@ -338,6 +343,7 @@ namespace Game.Movement
             _owner = owner;
             _transformForTransport = transformForTransport;
         }
+
         public Vector3 Calc(Vector3 input)
         {
             float x = input.X;