remove sidebar and make panels popup

src/node_panel_grid.h

@@ -37,6 +37,8 @@ class NodePanelGrid : public Node
 public:
     enum class ShadeMode : uint8_t { Transparent, Flat, Solid, Textured };
 
+    std::function<void(Node* target)> on_popup_close;
+
     NodeSliderH* m_groud_opacity;
     NodeSliderH* m_groud_value;
     NodeComboBox* m_groud_resolution;
@@ -74,6 +76,7 @@ public:
     virtual Node* clone_instantiate() const override;
     virtual void clone_finalize(Node* dest) const override;
     virtual void init() override;
+    virtual kEventResult handle_event(Event* e) override;
     void init_controls();
     int get_samples() const;
     int get_texres() const;