remove sidebar and make panels popup

src/node_panel_color.h

@@ -12,10 +12,12 @@ public:
     glm::vec4 m_color;
     glm::vec2 m_cursor;
     std::function<void(Node* target, glm::vec4 color)> on_color_changed;
+    std::function<void(Node* target)> on_popup_close;
     virtual Node* clone_instantiate() const override;
     virtual void clone_finalize(Node* dest) const override;
     virtual void init() override;
     virtual void added(Node* parent) override;
+    virtual kEventResult handle_event(Event* e) override;
     void init_controls();
     void set_color(glm::vec3 rgb);
 };