switch to redis pubsub for ipc

adjust commands to utilize channel names
add new config variables
fix mention race condition

irc/config.go

@@ -709,6 +709,14 @@ type Config struct {
 	}
 
 	Filename string
+
+	Cef struct {
+		Imagor struct {
+			Url    string
+			Secret string
+		}
+		Redis string
+	}
 }
 
 // OperClass defines an assembled operator class.