Remove extern crate statements

https://doc.rust-lang.org/edition-guide/rust-2018/module-system/path-clarity.html

src/ui/listview.rs

@@ -1,3 +1,4 @@
+use log::{info, trace};
 use std::cmp::{max, min, Ordering};
 use std::sync::{Arc, RwLock};