[CODE] Handle mediator events as ShortEvents

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Description Mediator events (some very specific events that trigger only for mediators and are handled separately inside events.py) should really be transferred into ShortEvents. I don't personally believe they need to be their own type of ShortEvent, rather they should be misc events that trigger only for mediators.

Essentially all that needs to be done here, is taking the hard coded events in mediator_events() and putting them into the misc event json. Documentation on the ShortEvent format is available in our wiki docs.

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