[Request] Widescreen/aspect ratio hack

[Margen67]

See https://github.com/mgba-emu/mgba/issues/1960

[fleroviux]

This kind of hack is not compatible with the accurate cycle-by-cycle rendering that NanoBoyAdvance implements. Supporting this would require a second rendering path. Unless the scanline renderer comes back as a second option some day, this is considered out-of-scope/not planned for now.