White/black lists for relays

[staab]

• [ ] Global setting for what to do when connecting to a relay not on the user's list: always, never, confirm (default)
• [ ] Global setting for whether to auth with unknown relays: always, never, confirm (default)
• [ ] When authing with a new relay, ask user permission based on the global setting and add to auth whitelist
• [ ] When selecting relays, penalize relays that the user hasn't connected to, or that have been blacklisted
• [ ] Show notification on relays navigation item when relay approvals are pending
• [ ] Redesign relays page or HUD to include advanced settings for relays
• [ ] Use welshman/thunk instead of publishes
• [ ] Measure invalid or muted events getting returned by relay, if the rate is significant warn the user somehow