Milestone 8 UX: folder tree workflows, about dialog, and app icon polish

src/profiles_tree_widget.h

@@ -0,0 +1,22 @@
+#ifndef ORBITHUB_PROFILES_TREE_WIDGET_H
+#define ORBITHUB_PROFILES_TREE_WIDGET_H
+
+#include <QTreeWidget>
+
+class QDropEvent;
+
+class ProfilesTreeWidget : public QTreeWidget
+{
+    Q_OBJECT
+
+public:
+    explicit ProfilesTreeWidget(QWidget* parent = nullptr);
+
+signals:
+    void itemsDropped();
+
+protected:
+    void dropEvent(QDropEvent* event) override;
+};
+
+#endif