Support per-channel NAMES and WHO

[ToxicFrog]

At the moment, trying to get a userlist for a channel just returns the userlist for the lounge. Ideally, we'd return the actual userlist using @statc, which returns something like:

#path/to/channel: <topic>
Created: <datetime> Last message: <datetime>
Users: <space-separated list of users>
Also: <space-separated list of idle users, each one enclosed with ()>
<more idle users, without the Also: prefix, repeated as many times as needed>
There are (no|<count>) new messages on #path/to/channel.

which means in practice we need to recognize the start of the reply, record the channel we're getting info from, and then split each user line and return each user as a 352 or 353.