Add structure-free read_multiple_bytes_packed #378
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Motivation: A server sends data packages that consist of multiple serialized capnproto messages of different structures. Every message is guaranteed the same first field, which works as a message header containing information about the message structure type. The scheme comprises the
UnknownMessage
structure that allows parsing the header only.Solution: Provide a public interface that iterates the buffer with AnyPointer readers, allowing casting a message to
UnknownMessage
first and then to a specific structure type.