AC-baidu： 优化百度、搜狗、谷歌搜索结果之关键词自动高亮

1.自动提取搜索页面的搜索关键词 2.对关键词自动进行高亮处理 W键可以取消高亮 3.动态获取动态的搜索关键词，重新高亮显示

As of 2018-05-31. See the latest version.

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