Unity 打包警告：ICON 压缩格式警告

Compressed texture icon is used as icon. This might compromise visual quality of the final image. Uncompressed format might be considered as better import option.

　　压缩纹理图标用作图标。这可能会影响最终图像的视觉质量。未压缩格式可能被认为是更好的导入选项。