Support for scrollable menu?

[JustSimplyKyle]

Basically, it's just that if there are more entries than the height can provie, being able to scroll down and look at the rest.

[Kirottu]

I am not quite sure how simple this would be to implement, it would probably require relatively major refactors. I will look into it when I have time.

[GlassyBridge]

I tried implementing this but it needs some fixes to work with a keyboard too.
#319