WebUI alternative listening port UPnP

[Majibow]

I was just playing around with WebUI 0.361 / uTorrent 1.8.1 and I noticed that when I used the alternative listening port I had to manually forward the ports on my router. I was wondering if you could implement UPnP requests for the alternative listening port option.

Basically

1. WebUI Enabled, Alternative listening port Enabled if previously Disabled or on uTorrent start-up -> send open alternative listening port

2. WebUI Enabled, Alternative listening port Disabled if previously Enabled-> send close alternative listening port

3. WebUI Enabled, Alternative listening port Changed -> send close old port, open new port

4. WebUI Disabled previously Enabled and Alternative listening port previously Enabled -> send close alternative listening port

5. On uTorrent exit if Enabled -> send close alternative listening port

All other cases -> do nothing

Looking forward to seeing this in the next release of uTorrent.

Edit: added 5th case