Dolphin multimonitor support.

[artantaaa]

I've had my desktop span three screens with eyefinity. I've also done it with an Nvidia card with twinview and xinerama on Linux (writing the xorg.conf was a big hassle). I think Nvidia's Windows driver has something called surround, but I haven't tried it. Multiple monitors aren't very useful for Dolphin though, except for having something else on another screen. You can't change the aspect ratio, so your extra screens just get to be letterbox bars. A 2x2 array would work, but I'd rather have a bigger screen, or just sit closer to the screen I have than stare at a big plus sign made of bezels. It would be great if there was some kind of ultra widescreen hack for Dolphin. Playing Mario Kart at 5780x1920 across three monitors would be fun.