Add support for Region/Country selection.

[Tutturuuu]

For example if I have the EU version of a game and want to play it in German.

[soyelmismo]

I need this because there's a game that is faster than normal, so I need to set EU region manually for that game (NES)

Update: I just noticed that I can change the name of the ROM and add (Europe) or the region at the end of the file and fix it... Maybe it can work for your case too