clean up layout dir

src/util/mod.rs

@@ -1,16 +1,16 @@
 mod arena;
-mod borrow;
 mod change;
 mod id;
 mod math;
 mod refcount;
+mod vec2;
 
 pub(crate) use arena::*;
-pub(crate) use borrow::*;
 pub use change::*;
 pub(crate) use id::*;
 pub(crate) use math::*;
 pub(crate) use refcount::*;
+pub use vec2::*;
 
 pub type HashMap<K, V> = fxhash::FxHashMap<K, V>;
 pub type HashSet<K> = fxhash::FxHashSet<K>;