add bbox auto zoom center and vertex moves independently #87
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本次新增两个功能:
1、新增一个开关,用来自动将第一个bbox自动居中放大,适合一张图只有一个标记框的场景,例如车牌识别
2、新增5个快捷键,用来通过键盘的上下左右单独移动bbox的四个顶点,方便精确移动顶点的场景