add download progress, improbable cloud browser, lock touch when pencil is down on iOS

engine/node_dialog_cloud.h

@@ -29,6 +29,7 @@ public:
 class NodeDialogCloud : public NodeBorder
 {
 public:
+    bool closed = false;
     NodeButton* btn_cancel;
     NodeButton* btn_ok;
     NodeButton* btn_delete;
@@ -43,5 +44,6 @@ public:
     virtual void init() override;
     void init_controls();
     virtual void loaded() override;
+    virtual void removed(Node* parent) override;
     void load_thumbs_thread();
 };