[Freature Request] Please add "Vertical crop" option like in the other console cores

[vanfanel]

Hi there,

This option, called "Vertical crop", is present on every other console core and makes the scaling always integer even if it means leaving a bit of the game screen out.
Think of it as "overscale": it forces every resolution of the system to be scaled to exactly 5x even if it means losing part of the upper and lower borders.

This is needed for proper scanlines (since it's an integer scaling) + big game view.

This should be an easy add by looking at how it's done on other systems: even computer cores have it :)

Thanks!