Refactor needs_download and rename library.items to better convey usage (#466)

* Refactor

* Rename items to playlists and update error message

src/ui/contextmenu.rs

@@ -51,7 +51,7 @@ impl ContextMenu {
         let mut list_select: SelectView<Playlist> = SelectView::new();
         let current_user_id = library.user_id.as_ref().unwrap();
 
-        for list in library.items().iter() {
+        for list in library.playlists().iter() {
             if current_user_id == &list.owner_id || list.collaborative {
                 list_select.add_item(list.name.clone(), list.clone());
             }

src/ui/playlists.rs

@@ -27,8 +27,8 @@ impl PlaylistsView {
     }
 
     pub fn delete_dialog(&mut self) -> Option<Modal<Dialog>> {
-        let store = self.library.items();
-        let current = store.get(self.list.get_selected_index());
+        let playlists = self.library.playlists();
+        let current = playlists.get(self.list.get_selected_index());
 
         if let Some(playlist) = current {
             let library = self.library.clone();

src/ui/queue.rs

@@ -67,7 +67,7 @@ impl QueueView {
         let mut list_select: SelectView<Option<String>> = SelectView::new().autojump();
         list_select.add_item("[Create new]", None);
 
-        for list in library.items().iter() {
+        for list in library.playlists().iter() {
             list_select.add_item(list.name.clone(), Some(list.id.clone()));
         }