add ppbr export dialog, implement text input focus

src/node_dialog_export_ppbr.h

@@ -0,0 +1,16 @@
+#pragma once
+#include "node_border.h"
+#include "node_button.h"
+#include "node_combobox.h"
+#include "node_text.h"
+
+class NodeDialogExportPPBR : public NodeBorder
+{
+public:
+    NodeButton* btn_cancel;
+    NodeButton* btn_ok;
+    virtual Node* clone_instantiate() const override;
+    virtual void clone_finalize(Node* dest) const override;
+    virtual void init() override;
+    void init_controls();
+};