Add 32:9 & 21:9 ultrawide resolutions

[mrienstra]

1. Add a 32:9 (356:100) ultrawide resolution of 5120x1440.
2. Add the following 3 21:9 (233:100) ultrawide resolutions:
   • 5120x2160 (technically 237:100)
   • 3840x1600 (technically 240:100)
   • 3440x1440 (technically 239:100)

I came up with these resolutions by looking at a few mainstream articles on ultrawide monitors, e.g. https://www.pcmag.com/picks/the-best-ultrawide-monitors

Continuation (of sorts) of #16, which mentions ultrawide resolutions, and #10 (which added 16:10 resolutions).