Provide an error framework for use with the TLSv1.3 code.

This is based on the libtls error handling code, but adds machine readable
codes and subcodes. We then map these codes back to libssl error

Provide an error framework for use with the TLSv1.3 code.

This is based on the libtls error handling code, but adds machine readable
codes and subcodes. We then map these codes back to libssl error codes.

ok beck@ inoguchi@

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