add load image from url

src/node_image.h

@@ -17,7 +17,10 @@ public:
     glm::vec2 m_sz;
     glm::vec2 m_scale = { 1.f, 1.f };
     std::string m_path;
+    std::string m_url;
     uint16_t m_tex_id;
+    std::shared_ptr<Asset> m_remote_asset;
+    std::shared_ptr<Texture2D> m_remote_texture;
     static void static_init();
     virtual Node* clone_instantiate() const override;
     virtual void clone_copy(Node* dest) const override;
@@ -25,5 +28,7 @@ public:
     virtual void restore_context() override;
     virtual void parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* attr) override;
     virtual void draw() override;
+    virtual void added(Node* parent) override;
     bool set_image(const std::string& path);
+    void load_url(const std::string& url);
 };