R1:9e0f70e17d56

Rewrite Aphlict to use Websockets

Summary:
Fixes T6559. No more flash, use Websockets. This is less aggressive than the earlier version, and retains more server logic.

- Support "wss".
- Make the client work.
- Remove "notification.user" entirely.
- Seems ok?

Test Plan:
In Safari, Firefox and Chrome, saw the browsers connect. Made a bunch of comments/updates and saw notifications.

Notable holes in the test plan:

- Haven't tested "wss" yet. I'll do this on secure.
- Notifications are //too…