60fps, vita 60fps and 1080p support

[catod0]

Retroarch core supports 60fps, yet I still use this nxengine release because of its widescreen support. I know vanilla runs on 50, but I find it annoying that only the retroarch version is the one I know runs fast and smooth.

Props to the team, this is a nice port!

By the way, this should be published in vitadb for better acccessibility, there's another cavestory PSVita port inferior to this one.

[xordspar0]

There's a discussion of 50 fps vs 60 fps over here: #6