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/widgets/widgetfadehelper.h

@@ -1,71 +0,0 @@
-/*
- * Strawberry Music Player
- * This file was part of Clementine.
- * Copyright 2010, David Sansome <me@davidsansome.com>
- *
- * Strawberry is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * Strawberry is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#ifndef WIDGETFADEHELPER_H
-#define WIDGETFADEHELPER_H
-
-#include "config.h"
-
-#include <stdbool.h>
-
-#include <QtGlobal>
-#include <QObject>
-#include <QWidget>
-#include <QString>
-#include <QPixmap>
-#include <QTimeLine>
-#include <QtEvents>
-
-class QEvent;
-class QPaintEvent;
-
-class WidgetFadeHelper : public QWidget {
-  Q_OBJECT
-
-public:
-  WidgetFadeHelper(QWidget* parent, int msec = 500);
-
-public slots:
-  void StartBlur();
-  void StartFade();
-
-protected:
-  void paintEvent(QPaintEvent*);
-  bool eventFilter(QObject* obj, QEvent* event);
-
-private slots:
-  void FadeFinished();
-
-private:
-  void CaptureParent();
-
-private:
-  static const int kLoadingPadding;
-  static const int kLoadingBorderRadius;
-
-  QWidget* parent_;
-  QTimeLine* blur_timeline_;
-  QTimeLine* fade_timeline_;
-
-  QPixmap original_pixmap_;
-  QPixmap blurred_pixmap_;
-};
-
-#endif // WIDGETFADEHELPER_H