Convert config/daily.pickle to config/reminders.yaml / config/alerts.yaml

[nmlorg]

I think I have #97 (comment) mostly ready to go, but it's another hairy change that I want to break apart and commit in pieces (though each commit will introduce new incompatible data changes).

• Convert each record from (time, events, message) to {'time': time, 'events': events, 'message': message}.
• Change records[botusername, groupid] to records[botusername][groupid].
• Convert {'message': message} to {'message_id': message['message_id'], 'message_type': ...} (to prevent lists of dicts — entities, photo, etc. — from needing to be stored).
• Store curmap instead of events.
• Either:
  • Convert all timestamps (eventtime as well as start and end for all events) from floats to ints, or:
  • Allow ImplicitTrackingDict/TrackingList to store floats.
• Have _daily_messages set records = multibot.conf['reminders'] and get _handle_alerts to use records = multibot.conf['alerts'].