@Override
    public void unsubscribeAll() {
        Protocol.broadcastPacket(this.subscribed, newObjectivePacket(UpdateType.REMOVE));
        this.subscribed.clear();
    }
Creates a new scoreboard objective

@param id the id of this objective
@param displayName the initial display name
@param displaySlot the initial display slot
helper/src/main/java/me/lucko/helper/scoreboard/PacketScoreboardObjective.java