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16格或25格的舒尔特方格，主要使用GridView.count建立方格、Timer计时、ColorTween颜色动画。
主要内容来自马友发的B站视频【无聊的编码】用Flutter让孩子“戒”掉打游戏，舒尔特方格是个什么鬼？？？，动画改用SingleTickerProviderStateMixin，使用单个controller实现。
效果图
