Add full dates for deceased

[mauvehed]

In prep for the twitter bot (#9), we need the full dates of as many people as possible so we can schedule tweets on anniversaries.

[attritionorg]

Ideally, birth date as well. Those are often mentioned in obits, so finding those for each person would be great.

[mauvehed]

Following up on this, cause we still need it, is a standardised format for the date for easy parsing.

I’m thinking seconds since EPOCH.