Games migration draft/skeleton/design/needs feedback

[jvc56]

Skeleton code for the games migration. For now, this draft PR can be treated more as a design that implementation. This might be deleted or rewritten as designs change. I find it easier to convey the ideas in code. The rough idea for a games migration that I'm thinking of is:

1. Implement omgwords db paradigm
2. Write to the omgwords db in parallel with the current db. Nothing depends on the omgwords tables yet.
3. Migrate old games to the omgwords paradigm. After this step, all games should be under the new omgwords paradigm
4. Read games from the omgwords tables.
5. Delete or move old games if needed.

Not sure if this is the right direction. Feedback is needed.