Add user datatype to keep

I also restructured some types so that I could grab a handle on the keep to
close it on shutdown, otherwise the database would be locked and I can't do
anything about it. This might mean I have to delete and start the database from
scratch when I deploy, but that's okay because I haven't stored anything yet.

I also renamed some stuff like 'deck' and 'beam' just for fun. I could make
these into more general interfaces like I always planned to.

Also I haven't really tested this yet, so... next commit will implement the user
login.

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