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/covermanager/amazoncoverprovider.cpp

@@ -111,7 +111,7 @@ void AmazonCoverProvider::QueryFinished(QNetworkReply *reply, int id) {
     
   reply->deleteLater();
   
-  QString data=(QString)reply->readAll();
+  QString data(reply->readAll());
 
   CoverSearchResults results;