Add generating thumbnails from cmd line

imageringlist.h

@@ -68,6 +68,7 @@ class ImageRingList : public QAbstractItemModel
     QThreadPool *m_thumbPool;
     Database *m_database;
     QStringList m_nameFilter;
+    QStringList m_fileSuffix;
     QTimer *m_slideShowTimer;
     QTimer *m_dirChangeDelay;
     QString m_currentDir;
@@ -76,6 +77,7 @@ public:
     ~ImageRingList() override;
     bool setDir(const QString path, const QString &currentFile = QString(), bool recursive = false);
     void setFile(const QString &file);
+    void setFiles(QStringList files);
     ImagePtr currentImage();
     void setLiveMode(bool live);
     void setCalculateStats(bool stats);
@@ -105,7 +107,7 @@ public slots:
     void decrement();
     void setMarked();
 protected:
-    void setFiles(const QStringList files, const QString &currentFile = QString());
+    void setFilesPrivate(const QStringList files, const QString &currentFile = QString());
     QList<ImagePtr>::iterator increment(QList<ImagePtr>::iterator iter);
     QList<ImagePtr>::iterator decrement(QList<ImagePtr>::iterator iter);
 signals: