给std::function的静态绑定增加引用类型参数的支持，以解决使用引用类型参数时会发生多次意外复制，以及无法传回数据的修改的问题 #2273
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提供个重现问题的例子？ |
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给std::function的静态绑定增加引用类型参数的支持，以解决使用引用类型参数时会发生多次意外复制，以及无法传回数据的修改的问题，同时给一些模板的类型匹配加上std::decay_t，避免某些时候出现匹配错误