vlink → internal 关系

文件在 include/vlink	在 include/vlink/internal 中引用
client.h	client-inl.h
getter.h	getter-inl.h
node.h	node-inl.h
publisher.h	publisher-inl.h
serializer.h	serializer-inl.h
server.h	server-inl.h
setter.h	setter-inl.h
subscriber.h	subscriber-inl.h