add scroll fn to traits

src/core/mod.rs

@@ -3,7 +3,6 @@ mod image;
 mod offset;
 mod pad;
 mod rect;
-mod scroll;
 mod sense;
 mod sized;
 mod span;
@@ -17,7 +16,6 @@ pub use image::*;
 pub use offset::*;
 pub use pad::*;
 pub use rect::*;
-pub use scroll::*;
 pub use sense::*;
 pub use sized::*;
 pub use span::*;