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/core/song.cpp

@@ -693,7 +693,7 @@ void Song::InitFromFilePartial(const QString &filename) {
 
   TagLib::FileRef fileref(filename.toUtf8().constData());
   //if (TagLib::FileRef::defaultFileExtensions().contains(suffix.toUtf8().constData())) {
-  if (fileref.file()) d->valid_ = true;
+  if (fileref.file() || (suffix == "dsf")) d->valid_ = true;
   else {
     d->valid_ = false;
     qLog(Error) << "File" << filename << "is not recognized by TagLib as a valid audio file.";