Fixes all clippy warnings

src/static_data/libraries/data_library.rs

@@ -43,6 +43,6 @@ pub trait DataLibrary<'a, T: 'a> {
     /// Gets a random value from the library.
     fn random_value(&self, rand: &mut Random) -> &T {
         let i = rand.get_between(0, self.len() as i32);
-        return &self.map().get_index(i as usize).unwrap().1;
+        return self.map().get_index(i as usize).unwrap().1;
     }
 }