Hex-encode non-ASCII random seeds in save files

The developer documentation claims that save files are long ASCII
strings.  This is mostly true, but there's nothing stopping a user
from entering non-ASCII characters as random seeds.  The ASCII
property of save files is useful, so encode seeds in hex before
writing them unless they consist only of printable ASCII characters.

Hex-encoded seeds are written under a new key, HEXSEED, to distinguish
them from unencoded seeds.  This means that old versions of the code
won't be able to load encoded seeds, but that's not a great loss:
seeds aren't generally portable between versions anyway.

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