Handle 'WHOL' messages

webmw doesn't seem to handle who list updates. From the browser console:

[{"doing": "", "pid": 11953, "id": 0, "idletime": 1508532555, "channel": 0, "name": "andy", "realname": "Andy", "dowhen": 0, "perms": {"status": "rms---p-", "chatprivs": "s", "chatmode": "", "protection": "0/0"}}, {"doing": "", "pid": 17010, "id": 1536, "idletime": 1508533206, "channel": 0, "name": "foo", "realname": "foo", "dowhen": 0, "perms": {"status": "r-----p-", "chatprivs": "s", "chatmode": "c", "protection": "0/0"}}]```