Cron task reporting

[jimmydorry]

Build old reporting style into new scheduler, taking advantage of new structure.

We should also be able to report multiple incidents per mod. We currently only report the first one, which can sometimes mask issues.

Base:

• [ ] Report on movements greater than the deviation (of the last 12 runs) in either direction, instead of based on percentage change
• [ ] Report on value becoming 0
• [ ] Report on value increasing from 0
• [ ] Report on new high value
• [ ] Significant events should hit the main channel. What kinds of events are significant?

Maybe Significant:

• [ ] Report high player failure rates
• [ ] Report when mod starts recording games with dedis
• [ ] Report when no games recorded for the day
• [ ] Report when schema has no new values for a week