refacto: moved systems from player controller physics process to their own signal based systems

systems/tween_queue/TweenQueueSystem.cs

@@ -0,0 +1,52 @@
+using Godot;
+using System.Collections.Generic;
+
+public partial class TweenQueueSystem : Node3D
+{
+    public record TweenInputs(Vector3 Location, float Duration);
+    
+    private Queue<TweenInputs> _tweenInputs = new Queue<TweenInputs>();
+    private Node3D _tweenObject;
+    private bool _isTweening = false;
+
+    public void Init(Node3D tweenObject)
+    {
+        _tweenObject = tweenObject;
+    }
+	
+    public void EndTween()
+    {
+        _isTweening = false;
+    }
+
+    private void TweenToLocation(TweenInputs inputs)
+    {
+        var (location, duration) = inputs;
+		
+        var tween = GetTree().CreateTween();
+        var callback = new Callable(this, MethodName.EndTween);
+				
+        tween.TweenProperty(_tweenObject, "position", location, duration);
+        tween.TweenCallback(callback);
+		
+        _isTweening = true;
+        tween.Play();
+    }
+
+    public void QueueTween(TweenInputs inputs)
+    {
+        _tweenInputs.Enqueue(inputs);
+    }
+
+    public void QueueTween(Vector3 location, float duration)
+    {
+        QueueTween(new TweenInputs(location, duration));
+    }
+
+    public void ProcessTweens()
+    {
+        if (_tweenInputs.Count > 0 && !_isTweening)
+            TweenToLocation(_tweenInputs.Dequeue());
+    }
+    
+}