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* Adds methods for copying raw data to the data field of Ethernet frames and UDP packets. This is used in the port to wrap the higher-layer packet data prepared by the contrib code with the additionally required headers before sending it at a network session. * Adds a method to cast raw data to an IPv4 packet. This is required in the port in order to check values in stand-alone IP packets produced by the contrib code before sending them at a network session. * Adds methods for setting UDP ports given big endian port values without having to convert to little endian in the app and then back to big endian in the net lib. Ref #4397