Add checkbox, scale more sizes by window scale

include/gui/Button.hpp

@@ -19,11 +19,13 @@ namespace gsr {
         void draw(mgl::Window &window, mgl::vec2f offset) override;
 
         mgl::vec2f get_size() override;
+        void set_border_scale(float scale);
 
         std::function<void()> on_click;
     private:
         mgl::vec2f size;
         mgl::Color bg_color;
         mgl::Text text;
+        float border_scale = 0.0015f;
     };
 }