More refactoring and cleanup

luprex/core/cpp/gui.hpp

@@ -30,13 +30,17 @@ class Gui {
 public:
     using EltVec = std::vector<GuiElt>;
 private:
+    int64_t place_;
     EltVec elts_;
 public:
+    Gui() { place_ = 0; }
+    int64_t place() { return place_; }
     const EltVec &elts() const { return elts_; }
-    void clear() { elts_.clear(); }
+    void clear(int64_t p) { place_ = p; elts_.clear(); }
     bool has_action(const std::string &action) const;
     void menu_item(const std::string &action, const std::string &label);
     std::string get_action(int index);
+    std::string menu_debug_string() const;
 
     // Put a pointer to a gui into the lua registry.
     //