Ultrawide display support

Just a minor bug, but when running Retroarch on an ultrawide (21:9) display, the front end UI is cropped. So rather than being wider than a 16:9 display, it’s just zoomed up and missing the top and bottom.

This makes the fonts kind of jumbo sized, and the box artwork is half off the bottom of the screen.

As I say, not a big issue, especially as the emulators themselves work fine, but it would be a nice one to fix at some point.

Thanks all.

You can try going to settings > menu (or settings > user interface > menu in the latest nightlies) and play with the menu scale factor to shrink things down a bit.