unserding

Release Notes: Payload lengths are now expanded to size_t properly (without sign expansion). Payloads of 256b and larger are now encoded and decoded properly.

Release Notes: This release provides a new, leaner, message-based API: ud_socket() to acquire a socket and instantiate pub/sub'bing, ud_close() to close the socket, ud_pack_msg() to pack a message onto the socket, ud_flush() to send off packed messages, ud_chck_msg() to unpack messages from the socket, and ud_dscrd() to reset the receiver buffer. Compatibility with the old API is dropped.