Event emitter for mail (just unread mail count for now)

web/lib/events/mail.js

+load(settings.web_lib + 'forum.js');
+
+var last_run = 0;
+var frequency = 10;
+
+function cycle() {
+    if (user.number < 1 || user.alias == settings.guest) return;
+    if (time() - last_run <= frequency) return;
+    last_run = time();
+    const count = user.stats.mail_waiting;
+    if (count > 0) emit({ event: 'mail', data: JSON.stringify({ count: count })});
+}
+
+this;