BU 1.0

[noahlevenson]

BU 1.0 is to be the first version of BU that is technologically capable of achieving its stated business objectives -- that is, it can carry a meaningful quantity of real traffic, improving our blocking resistance and saving us some measurable quantity of dollars in bandwidth costs.

Here's what it'll take to get us there:

### Tasks
- [ ] [Improve balancer interaction](https://github.com/getlantern/broflake/issues/174)
- [ ] Introduce fault recovery
- [ ] Make Freddie horizontally scalable
- [ ] Make the egress server horizontally scalable
- [ ] [Add a BU protocol layer to help solve some of these problems (?)](https://github.com/getlantern/broflake/issues/127)
- [ ] On the censored side, enable BU for mobile users and solve any related NAT traversal issues
- [ ] Enable a real whitelist, not just ad domains
- [ ] Acquire X [TBD] DAU on the uncensored side

[noahlevenson]

Adding a note via @myleshorton:

When we try updating quic-go, everything breaks. But we need to update quic-go, because we need to update our Go version. So while I'm doing surgery on the protocol stack (for fault recovery etc.) I need to figure out what's going on with quic-go and fix it.

[noahlevenson]

I need to figure out what's going on with quic-go and fix it.

Fix is here: https://github.com/getlantern/broflake/pull/207