reworked Mark function to handle Clear function, fixed Goal class to adjusted address format, added shufflecellsfunction

Gameplay/Board.cs

@@ -52,7 +52,7 @@ public partial class Board : Sprite2D
     public void ClearBoard(){
         foreach (Cell cell in _cells)
         {
-            cell.Clear();
+            cell.Mark();
         }
     }
 
@@ -88,9 +88,7 @@ public partial class Board : Sprite2D
 
     public void RenumberCells()
     {
-        GD.Print(string.Join(", ", _cells.Select(c=>c._address)));
         _cells = _cells.OrderBy(c => c.Position.Y).ThenBy(c => c.Position.X).ToList();
-        GD.Print(string.Join(", ", _cells.Select(c=>c._address)));
 
         for (int i = 0; i < _cells.Count; i++)
         {