add remote page loading

src/node_remote_page.h

@@ -0,0 +1,23 @@
+#pragma once
+#include "node_border.h"
+
+class NodeRemotePage : public NodeBorder
+{
+    class NodeScroll* m_content;
+    class NodeText* m_title;
+    bool m_loading;
+    std::string m_url;
+public:
+    bool m_loaded;
+    int m_page_id;
+    virtual Node* clone_instantiate() const override;
+    virtual void clone_copy(Node* dest) const override;
+    virtual void init() override;
+    void init_controls();
+    std::future<bool> load_url(const std::string& url, 
+        std::function<void(bool success)> on_complete = nullptr) noexcept;
+    void reload() noexcept;
+    void set_title(const std::string& title);
+    void add_button(const std::string& label, int width,
+        std::function<void(Node* target)> onclic = nullptr) noexcept;
+};