Improve album cover loader, lyrics search and streaming support

- Improve album cover loader
- Add album cover loader result struct
- Move album cover thumbnail scaling to album cover loader
- Make init art manual look for album cover images in song directory
- Make album cover search work for songs outside of collection and
  streams
- Make album cover search work based on artist + title if album is not
  present
- Update art manual in playlist for local files, devices and CDDA
- Make lyrics search work for streams
- Add stream dialog to menu
- Remove dead code in InternetSearchModel
- Simplify code in InternetSearchView

src/collection/collectionfilterwidget.cpp

@@ -297,6 +297,7 @@ void CollectionFilterWidget::SetCollectionModel(CollectionModel *model) {
 }
 
 void CollectionFilterWidget::GroupByClicked(QAction *action) {
+
   if (action->property("group_by").isNull()) {
     group_by_dialog_->show();
     return;
@@ -304,6 +305,7 @@ void CollectionFilterWidget::GroupByClicked(QAction *action) {
 
   CollectionModel::Grouping g = action->property("group_by").value<CollectionModel::Grouping>();
   model_->SetGroupBy(g);
+
 }
 
 void CollectionFilterWidget::GroupingChanged(const CollectionModel::Grouping &g) {