Add smart playlists, ratings and Qobuz

Fixes #259
Fixes #264

src/smartplaylists/playlistgenerator.cpp

@@ -0,0 +1,43 @@
+/*
+ * 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/>.
+ *
+ */
+
+#include "config.h"
+
+#include <QObject>
+#include <QString>
+
+#include "core/logging.h"
+
+#include "playlistgenerator.h"
+#include "playlistquerygenerator.h"
+
+const int PlaylistGenerator::kDefaultLimit = 20;
+const int PlaylistGenerator::kDefaultDynamicHistory = 5;
+const int PlaylistGenerator::kDefaultDynamicFuture = 15;
+
+PlaylistGenerator::PlaylistGenerator() : QObject(nullptr) {}
+
+PlaylistGeneratorPtr PlaylistGenerator::Create(const Type type) {
+
+  Q_UNUSED(type)
+
+  return PlaylistGeneratorPtr(new PlaylistQueryGenerator);
+
+}