Mark a person as Payed
Story
As a Conference Organizer, I want to be able to mark people "payed" for the Conference, to have an overview over who has and who as not payed already.
Dependencies
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Before we can do this, #135 (closed) has to be closed
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#123 (closed) is depending on this
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This state needs to be put on the conference-user, since the person will pay for one conference, not all of them. When we put this on conference_user, we won't have to go through to all event_people to update the state. Therefore, this is closely tied to #126 (closed) - see this issue about what has to be done there.