Image组件新增功能：支持上下对称，左右对称，上下左右对称的方式填充纹理 #739
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这提交使Image组件可以支持以3种方式进行纹理填充。
实现原理和九宫格类似，渲染时额外的创建顶点和uv进行渲染提交。
三种填充模式的渲染效果如下图：