implement frame buffer fetch extension for iOS, change composition on stroke drawing and commit, add rename layer dialog

engine/node_dialog_layer_rename.h

@@ -0,0 +1,19 @@
+#pragma once
+#include "node_border.h"
+#include "node_button.h"
+#include "node_text_input.h"
+
+class NodeDialogLayerRename : public NodeBorder
+{
+public:
+    NodeButton* btn_cancel;
+    NodeButton* btn_ok;
+    NodeTextInput* input;
+    std::string data_path;
+    virtual Node* clone_instantiate() const override;
+    virtual void clone_finalize(Node* dest) const override;
+    virtual void init() override;
+    void init_controls();
+    virtual void loaded() override;
+    std::string get_name();
+};