Re-add support for /me messages from IRC

It was recently removed because it was handled in the old "convert irc
colors" code. It now is in the right place.

src/irc/irc_client.cpp

@@ -219,6 +219,13 @@ void IrcClient::on_channel_message(const IrcMessage& message)
       iid.chan = nick;
       muc = false;
     }
+  if (!body.empty() && body[0] == '\01')
+    {
+      if (body.substr(1, 6) == "ACTION")
+        this->bridge->send_message(iid, nick,
+                  std::string("/me") + body.substr(7, body.size() - 8), muc);
+    }
+  else
     this->bridge->send_message(iid, nick, body, muc);
 }