Rework loading maps to be asynchronous, change debug menu so that its not completely pausing the game

Zennysoft.Game.Ma/src/menu/LoadingScreen.cs

@@ -1,20 +1,12 @@
 using Chickensoft.AutoInject;
 using Chickensoft.Introspection;
 using Godot;
-using Zennysoft.Game.Ma;
 
 [Meta(typeof(IAutoNode))]
 public partial class LoadingScreen : Control
 {
   public override void _Notification(int what) => this.Notify(what);
 
-  public override void _Process(double delta)
-  {
-    if (Input.IsActionJustPressed(GameInputs.Next))
-    {
-    }
-    if (Input.IsActionJustPressed(GameInputs.Previous))
-    {
-    }
-  }
+  [Node]
+  public ProgressBar ProgressBar { get; set; } = default!;
 }