drop unused typedefs

--HG--
branch : nmdc-ircfrontend

typedefs.go

@@ -20,32 +20,6 @@ var (
 	channelRegexp = regexp.MustCompile(`^#[a-zA-Z0-9_\-]+$`)
 )
 
-type ClientMode struct {
-	operator bool //Channel operator
-}
-
-func (m *ClientMode) Prefix() string {
-	if m.operator {
-		return "@"
-	} else {
-		return ""
-	}
-}
-
-func (m *ClientMode) String() string {
-	if m.operator {
-		return "o"
-	} else {
-		return ""
-	}
-}
-
-type signalCode int
-
-const (
-	signalStop signalCode = iota
-)
-
 type replyCode int
 
 const (