Make deleting custom levelsets much easier

[Blazindudereflamed]

Think of it like an button on the levelsets menu.

[Holger]

A button to delete custom level sets from the level editor would technically be possible, yes.

So far I just did not think of such a feature, or that it might be useful for somebody. But yes, while it is relatively easy to just delete the level set folder on classic operating systems like Linux, Windows or Mac, it is indeed much more complicated on Android, for example.