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This implements state DAGs, without support for federation. A general overview: - It adds a new room version and new event type. - It adds a new field `calculated_auth_event_ids` to internal metadata. - It stores the state DAG via new state DAG edges / forward extremities tables. - It adds new auth rules as per the MSC. - It uses the new `prev_state_events` field instead of `prev_event_ids()` when doing state resolution.