Resume drafts

[wrmacrae]

For very high stakes play (or high viewership events), we should have a way to save off the current state of a draft, and resume it later, in the event Heroku has an outage (or a player has an uncontrollable loss of power/internet). I think this might be a longer-term feature request, but wanted to start tracking it.

Even without persistence on the backend, you could imagine making partial-logs available to the owner (and in such a case, having a judge run the event as a non-player owner). Then we'd want to give the owner access to a partial log at all times, and figure out a way to rehydrate the state of a draft from that partial log.