added directory browsing and icon size slider

ui/sourceiconview.h

@@ -0,0 +1,18 @@
+#ifndef SOURCEICONVIEW_H
+#define SOURCEICONVIEW_H
+
+#include <QListView>
+
+class Project;
+
+class SourceIconView : public QListView {
+    Q_OBJECT
+public:
+    SourceIconView(QWidget* parent = 0);
+    Project* project_parent;
+    void mouseDoubleClickEvent(QMouseEvent *event);
+signals:
+    void changed_root();
+};
+
+#endif // SOURCEICONVIEW_H