Add new method for updating songs based on song ID

Show status updating database.

Fixes #750

src/collection/collectiontask.h

@@ -0,0 +1,40 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2021, Jonas Kvinge <jonas@jkvinge.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 COLLECTIONTASK_H
+#define COLLECTIONTASK_H
+
+#include <QtGlobal>
+#include <QString>
+
+class TaskManager;
+
+class CollectionTask {
+ public:
+  explicit CollectionTask(TaskManager *task_manager, const QString &message);
+  ~CollectionTask();
+
+ private:
+  TaskManager *task_manager_;
+  int task_id_;
+
+  Q_DISABLE_COPY(CollectionTask)
+};
+
+#endif  // COLLECTIONTASK_H