Encode Hotline time seconds from the 1904 Mac epoch

The seconds field of the 8-byte Hotline time was encoded as seconds since
the start of the current year. Clients that decode this field as a raw
classic Mac OS timestamp (e.g. Pitbull Pro) therefore always rendered the
year as 1904, since the value was under one year past the 1904 epoch.

Encode seconds from 1904-01-01 to match the original Hotline server, and
decode symmetrically. Fixes #166.

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