Treat server broadcasts as highlights

lib/irc.js

@@ -288,6 +288,13 @@ export function isHighlight(msg, nick, cm) {
 	}
 }
 
+export function isServerBroadcast(msg) {
+	if (msg.command != "PRIVMSG" && msg.command != "NOTICE") {
+		return false;
+	}
+	return msg.params[0].startsWith("$");
+}
+
 export function isError(cmd) {
 	if (cmd >= "400" && cmd <= "568") {
 		return true;