Port widescreen/HD Mode 7 hack from bsnes-hd

[Margen67]

I'm not sure how difficult it would be to add, but it would be quite nice.
Widescreen works for both Mode 7 and sprite-based games:
https://www.reddit.com/r/emulation/comments/bmc9t9/bsneshd_beta_5_bsnes_1073_formally_hd_mode_7_mod/
Video demonstration: https://youtu.be/RFCWAQlb7y0

[nijoakim]

Related: https://byuu.org/link:20190808_095446

Byuu says he is going to add the widescreen feature to bsnes official as soon as there is at least one patch for a major title making use of the feature.

[hizzlekizzle]

I don't think it's going to be feasible to backport it, but we have a new WIP libretro-ization of bsnes-hd that will probably obsolete the old v094-based bsnes-es.

[nijoakim]

Oh! Very nice to hear! Looking forward to it!