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/ratingwidget.h

@@ -1,83 +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 RATINGWIDGET_H
-#define RATINGWIDGET_H
-
-#include "config.h"
-
-#include <QObject>
-#include <QWidget>
-#include <QString>
-#include <QPixmap>
-#include <QPainter>
-#include <QRect>
-#include <QSize>
-#include <QPoint>
-#include <QtEvents>
-
-class QEvent;
-class QMouseEvent;
-class QPaintEvent;
-
-class RatingPainter {
-public:
-  RatingPainter();
-
-  static const int kStarCount = 5;
-  static const int kStarSize = 15;
-  static QRect Contents(const QRect& rect);
-  static double RatingForPos(const QPoint& pos, const QRect& rect);
-
-  void Paint(QPainter *painter, const QRect& rect, float rating) const;
-
-private:
-  QPixmap stars_[kStarCount*2+1];
-};
-
-class RatingWidget : public QWidget {
-  Q_OBJECT
-  Q_PROPERTY(float rating READ rating WRITE set_rating);
-
- public:
-  RatingWidget(QWidget *parent = nullptr);
-
-  QSize sizeHint() const;
-
-  float rating() const { return rating_; }
-  void set_rating(float rating);
-
-signals:
-  void RatingChanged(float rating);
-
-protected:
-  void paintEvent(QPaintEvent*);
-  void mousePressEvent(QMouseEvent *e);
-  void mouseMoveEvent(QMouseEvent *e);
-  void leaveEvent(QEvent*);
-
-private:
-  RatingPainter painter_;
-  float rating_;
-  float hover_rating_;
-};
-
-#endif  // RATINGWIDGET_H
-