Add Core Option Categories and Auto Detected SGB Model From Downstream [libretro]

[Awakened0]

When building from this upstream repo, core option categories are not working.

Upstream:

Libretro Repo:

And the Auto Detected SGB Model option is not exposed in the upstream built core.

[radimerry]

I think this can be closed as of libretro 0.15.6.

[Awakened0]

Yeah, compiled from this repo and everything looks good!

Thanks!