singlecoder

I had fix this bug, you can see https://github.com/oasis-engine/engine/pull/247

1、下方调整大小那里的鸟出来的很突然，应该在添加小鸟后面才出来  2、SpriteAtlas 在完整做完后，当作优化点提出，前面提出来感知不强，而且后面全篇再也没有了

> > When enableWrapping is true, width is 0, display nothing is expected.

> There is a doubt that the current `BatchManager` is subordinate to the `Camera`. When the number of cameras increases, the memory occupied by `Batch2D` will also increase multiple times....

在房间的四周都加一个立方体形状的碰撞盒就好了