xhj/embeded-gateway: 网关代码

xhj 4d99525703 first commit		6 月之前
..
formatters	4d99525703 first commit	6 月之前
predicates	4d99525703 first commit	6 月之前
attr.hpp	4d99525703 first commit	6 月之前
attr_fwd.hpp	4d99525703 first commit	6 月之前
filter.hpp	4d99525703 first commit	6 月之前
formatter.hpp	4d99525703 first commit	6 月之前
formatters.hpp	4d99525703 first commit	6 月之前
is_keyword_descriptor.hpp	4d99525703 first commit	6 月之前
keyword.hpp	4d99525703 first commit	6 月之前
keyword_fwd.hpp	4d99525703 first commit	6 月之前
message.hpp	4d99525703 first commit	6 月之前
predicates.hpp	4d99525703 first commit	6 月之前
record.hpp	4d99525703 first commit	6 月之前