Add optional delete from disk in collection and playlist

Fixes #284

src/core/utilities.cpp

@@ -253,6 +253,30 @@ QString MakeTempDir(const QString template_name) {
 
 }
 
+bool MoveToTrashRecursive(const QString &path) {
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
+  QDir dir(path);
+  for (const QString &child : dir.entryList(QDir::NoDotAndDotDot | QDir::Dirs | QDir::Hidden)) {
+    if (!MoveToTrashRecursive(path + "/" + child))
+      return false;
+  }
+
+  for (const QString &child : dir.entryList(QDir::NoDotAndDotDot | QDir::Files | QDir::Hidden)) {
+    if (!QFile::moveToTrash(path + "/" + child))
+      return false;
+  }
+
+  return dir.rmdir(path);
+
+#else
+
+  return false;
+
+#endif
+
+}
+
 bool RemoveRecursive(const QString &path) {
 
   QDir dir(path);