修复polygon数组错误 修复emit空注册报错

source/src/Physics/Shapes/Shape.ts

@@ -1,6 +1,8 @@
 abstract class Shape {
     public bounds: Rectangle;
     public position: Vector2;
+    public center: Vector2;
 
+    public abstract recalculateBounds(collider: Collider);
     public abstract pointCollidesWithShape(point: Vector2): CollisionResult;
 }