Rename class BoundingBox2 to Rectangle

QuadtreeTests/Tests.cs

@@ -12,7 +12,7 @@ namespace QuadtreeTests
 
             public float BoundingRadius { get; } = 1.0f;
 
-            public BoundingBox2 BoundingBox { get; } = new BoundingBox2(position - Vector2.One, position + Vector2.One);
+            public Rectangle BoundingBox { get; } = new Rectangle(position - Vector2.One, position + Vector2.One);
         }
 
         private List<Vector2> _positions;
@@ -58,7 +58,7 @@ namespace QuadtreeTests
         {
             AddObjectsAndAssertCount();
             List<IWorldObject> result = new();
-            _quadtree.Query(new BoundingBox2(new Vector2(3.5f, 3.5f), new Vector2(10.0f, 10.0f)), result);
+            _quadtree.Query(new Rectangle(new Vector2(3.5f, 3.5f), new Vector2(10.0f, 10.0f)), result);
             Assert.That(result.Count, Is.EqualTo(2));
         }