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/context/contextview.h

@@ -0,0 +1,164 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2013, Jonas Kvinge <jonas@strawbs.net>
+ *
+ * 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 CONTEXTVIEW_H
+#define CONTEXTVIEW_H
+
+#include "config.h"
+
+#include <memory>
+#include <stdbool.h>
+
+#include <QtGlobal>
+#include <QObject>
+#include <QWidget>
+#include <QString>
+#include <QImage>
+#include <QPixmap>
+#include <QPainter>
+#include <QMovie>
+#include <QTimeLine>
+#include <QAction>
+#include <QMenu>
+#include <QLabel>
+#include <QtEvents>
+
+#include "core/song.h"
+#include "covermanager/albumcoverloaderoptions.h"
+
+#include "ui_contextviewcontainer.h"
+
+using std::unique_ptr;
+
+class Application;
+class CollectionView;
+class CollectionModel;
+class AlbumCoverChoiceController;
+class Ui_ContextViewContainer;
+class ContextAlbumsView;
+class LyricsFetcher;
+
+class ContextView : public QWidget {
+  Q_OBJECT
+
+ public:
+  ContextView(QWidget *parent = nullptr);
+  ~ContextView();
+
+  void SetApplication(Application *app);
+  void SetCollectionView(CollectionView *collectionview);
+
+  ContextAlbumsView *albums() { return ui_->widget_play_albums; }
+
+ public slots:
+  void UpdateNoSong();
+  void Playing();
+  void Stopped();
+  void Error();
+  void SongChanged(const Song &song);
+  void AlbumArtLoaded(const Song &song, const QString &uri, const QImage &image);
+
+  void LoadCoverFromFile();
+  void SaveCoverToFile();
+  void LoadCoverFromURL();
+  void SearchForCover();
+  void UnsetCover();
+  void ShowCover();
+  void SearchCoverAutomatically();
+  void AutomaticCoverSearchDone();
+  void UpdateLyrics(quint64 id, const QString lyrics);
+
+ private:
+
+  enum WidgetState {
+    //State_None = 0,
+    State_Playing,
+    State_Stopped
+  };
+
+  static const char *kSettingsGroup;
+  static const int kPadding;
+  static const int kGradientHead;
+  static const int kGradientTail;
+  static const int kMaxCoverSize;
+  static const int kBottomOffset;
+  static const int kTopBorder;
+
+  Application *app_;
+  Ui_ContextViewContainer *ui_;
+  CollectionView *collectionview_;
+  WidgetState widgetstate_;
+  QMenu *menu_;
+  QTimeLine *timeline_fade_;
+  QImage image_strawberry_;
+  AlbumCoverChoiceController *album_cover_choice_controller_;
+  LyricsFetcher *lyrics_fetcher_;
+  bool active_;
+  bool downloading_covers_;
+
+  QAction *action_show_data_;
+  QAction *action_show_output_;
+  QAction *action_show_albums_;
+  QAction *action_show_lyrics_;
+  AlbumCoverLoaderOptions cover_loader_options_;
+  Song song_;
+  Song song_empty_;
+  Song song_prev_;
+  QImage image_original_;
+  QImage image_previous_;
+  QPixmap *pixmap_album_;
+  QPixmap pixmap_current_;
+  QPixmap pixmap_previous_;
+  QPainter *painter_album_;
+  qreal pixmap_previous_opacity_;
+  std::unique_ptr<QMovie> spinner_animation_;
+
+  QString prev_artist_;
+  QString lyrics_;
+
+  void LoadSettings();
+  void AddActions();
+  void SetText(QLabel *label, int value, const QString &suffix, const QString &def = QString());
+  void NoSong();
+  void UpdateSong();
+  void SetImage(const QImage &image);
+  void DrawImage(QPainter *p);
+  void ScaleCover();
+  bool GetCoverAutomatically();
+
+ protected:
+  bool eventFilter(QObject *, QEvent *);
+  void handlePaintEvent(QObject *object, QEvent *event);
+  void PaintEventAlbum(QEvent *event);
+  void contextMenuEvent(QContextMenuEvent *e);
+  void mouseReleaseEvent(QMouseEvent *);
+  void dragEnterEvent(QDragEnterEvent *e);
+  void dropEvent(QDropEvent *e);
+
+ private slots:
+  void ActionShowData();
+  void ActionShowOutput();
+  void ActionShowAlbums();
+  void ActionShowLyrics();
+  void FadePreviousTrack(qreal value);
+
+};
+
+#endif  // CONTEXTVIEW_H
+