[rdrake]

What

Bouncer compatibility for ZNC and soju. Every change keys on what the server offers, so nefarious2 and plain ircds see no change.

• ZNC buffer replay (BATCH znc.in/playback) is delivered as catch-up: appended, counted unread, no notification or highlight. ZNC has no msgids, so a buffered line is known by its time, sender, target and text, counted per conversation; a buffer ZNC keeps across attaches is not shown twice.
• The bouncer owns the channel list. Behind ZNC (znc.in/* caps) or soju (BOUNCER_NETID, soju.im/bouncer-networks) the saved channels are never JOINed; the bouncer's own JOINs rebuild the list, so a channel parted from another client stays parted. Same rule as gamja.
• soju web push: soju.im/webpush is requested alongside draft/webpush. Same command, VAPID token and payload.
• soju search: a server that answers FAIL SEARCH INVALID_PARAMS in is asked once per joined channel, one after another (soju 0.7 has no labeled-response), and the parts are merged into one page. A server with MSGREFTYPES=timestamp is asked for a hit's context by its time.
• soju networks (soju.im/bouncer-networks): a login without a network is the control connection. After a SASL login, each network it lists is added as its own saved network, bound with BOUNCER BIND before CAP END. A network the user removes is not added back. Ids are validated, at most 20 per list. The service worker binds too, so replying from a notification reaches the right network.

Testing

• New mocha tests in test/irc/bouncer.ts, plus historysearch.ts, webpush.ts and caps.ts updates. Full suite, lint, typecheck, build and the smoke scenario pass.
• Checked live in Chromium against soju 0.7 (networks added, bound, channels joined) and ZNC 1.9 (buffer shown once, in order).

Notes

• Conflicts lightly with Add an optional server password (PASS) for networks #221 (server password): keep both options, and networks added from soju should also carry serverPassword. Whichever lands second takes that.
• Not covered: TOFU certificate pinning for self-signed ZNC over TCP, ZNC's *playback module, CertFP.