curl timeout, reorder layers, handle right click osx

engine/canvas.h

@@ -23,8 +23,8 @@ public:
     bool m_show_tmp = false;
     std::vector<Layer> m_layers;
     std::vector<Stroke> m_strokes;
+    std::vector<int> m_order;
     RTT m_tmp;
-    //RTT m_fb;
     Texture2D m_tex;
     Texture2D m_tex2;
     Sampler m_sampler;
@@ -33,6 +33,7 @@ public:
     bool create(int width, int height);
     void resize(int width, int height);
     void layer_add(std::string name);
+    void layer_order(int idx, int pos);
     void stroke_start(glm::vec2 point, float pressure, const ui::Brush& brush);
     void stroke_update(glm::vec2 point, float pressure);
     void stroke_draw();