New context with albums and lyrics +++ much more

* Added new lyrics provider with lyrics from AudD and API Seeds
* New improved context widget with albums and lyrics
* Fixed playing and context widget getting stuck in play mode when there was an error
* Changed icons for artists in collection, tidal and cover manager
* Removed "search" icon from "Search automatically" checkbox (right click) that looked ugly
* Removed some unused widgets from the src/widgets directory
* Fixed initial size of window and side panel
* Fixed saving window size correctly

src/collection/collectiondirectorymodel.cpp

@@ -36,6 +36,8 @@
 #include "collectionbackend.h"
 #include "collectiondirectorymodel.h"
 
+using std::shared_ptr;
+
 CollectionDirectoryModel::CollectionDirectoryModel(CollectionBackend *backend, QObject *parent)
     : QStandardItemModel(parent),
       dir_icon_(IconLoader::Load("document-open-folder")),