This is handled by the buffer store.

Closes: https://todo.sr.ht/~emersion/gamja/47

syncBufferUnread might override the previous unread value.

Closes: https://todo.sr.ht/~emersion/gamja/105

This allows WHOX to be used.

Closes: https://todo.sr.ht/~emersion/gamja/101

This allows querying the account of the user.

This allows us to store information about users in a signle place,
instead of putting it in user buffers. This is required to display
metadata about users in the channel members list.

Trailing CRLF must not be included in WebSocket messages.

Closes: https://todo.sr.ht/~emersion/gamja/104

Fixes: a51be503 ("lib/irc: only add colon to trailing arg when necessary")

The error event handler is useless, because the error event is never
emitted without a close event, and doesn't give any details about
the error.

See https://ircv3.net/specs/extensions/chghost

This mirrors go-irc's behavior:

https://github.com/go-irc/irc/blob/7ba1a1858f5ee2a44f18501b486ec11dd1990018/parser.go#L374

Closes: https://todo.sr.ht/~emersion/gamja/103

Closes: https://todo.sr.ht/~emersion/gamja/100

Closes: https://todo.sr.ht/~emersion/gamja/102

Closes: https://todo.sr.ht/~emersion/gamja/96

This field is intentionally behind the latest read receipt. Let's
rename it to make that clearer.

Closes: https://todo.sr.ht/~emersion/gamja/76

When we've received RPL_WELCOME, latestReceipt will return the
current time if we don't filter out the server buffer.

Closes: https://todo.sr.ht/~emersion/gamja/84

Closes: https://todo.sr.ht/~emersion/gamja/75
Closes: https://todo.sr.ht/~emersion/gamja/89