commit 2aab421

Cleanup unused caps

They don't add anything in the UI, and generate useless traffic.

Account tracking is not used:
- account-notify
- account-tag
- extended-join

We don't really care about users, hosts, nor real names:
- extended-join
- userhost-in-names

away-notify and invite-notify are also not used, but will be in the near
future.

 1@@ -46,22 +46,18 @@ func (auth *SASLPlain) Respond(challenge string) (res string, err error) {
 2 
 3 // SupportedCapabilities is the set of capabilities supported by this library.
 4 var SupportedCapabilities = map[string]struct{}{
 5-	"account-notify":    {},
 6-	"account-tag":       {},
 7-	"away-notify":       {},
 8-	"batch":             {},
 9-	"cap-notify":        {},
10+	"away-notify":   {},
11+	"batch":         {},
12+	"cap-notify":    {},
13+	"echo-message":  {},
14+	"invite-notify": {},
15+	"message-tags":  {},
16+	"multi-prefix":  {},
17+	"server-time":   {},
18+	"sasl":          {},
19+	"setname":       {},
20+
21 	"draft/chathistory": {},
22-	"echo-message":      {},
23-	"extended-join":     {},
24-	"invite-notify":     {},
25-	"labeled-response":  {},
26-	"message-tags":      {},
27-	"multi-prefix":      {},
28-	"server-time":       {},
29-	"sasl":              {},
30-	"setname":           {},
31-	"userhost-in-names": {},
32 }
33 
34 // Values taken by the "@+typing=" client tag.  TypingUnspec means the value or
35@@ -747,7 +743,7 @@ func (s *Session) handleRegistered(msg Message) Event {
36 		if c, ok := s.channels[channelCf]; ok {
37 			return ModeChangeEvent{
38 				Channel: c.Name,
39-				Mode: strings.Join(msg.Params[1:], " "),
40+				Mode:    strings.Join(msg.Params[1:], " "),
41 			}
42 		}
43 	case "PRIVMSG", "NOTICE":