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aa7b0a31b0
This replaces the stateful class parser with a stateless free function. The protocol buffer message is parsed using a ZeroCopyInputStream. * Invoke method is now a free function. * Protocol handler doesn't need to derive from an abstract interface * Only up to one message is processed at a time by the invoker. * Remove error_code return from the handler's message processing functions. * Add ZeroCopyInputStream implementation that wraps a BufferSequence. * Free function parses up to one protocol message and calls the handler. * Message type and size can be calculated from an iterator range or a buffer sequence.