Radio link did not need Cow.

I was only using Cow because regular links can use templates which would require owned data. Radio links do not share this feature.

src/types/object.rs

@@ -97,8 +97,8 @@ pub struct RadioTarget<'s> {
 #[derive(Debug, PartialEq)]
 pub struct RadioLink<'s> {
     pub source: &'s str,
-    pub path: Cow<'s, str>,
-    pub raw_link: Cow<'s, str>,
+    pub path: &'s str,
+    pub raw_link: &'s str, // TODO: Is this always the same as path? If so, this could be a function instead of a field.
     pub children: Vec<Object<'s>>,
 }