undo clear items

src/scenario/town.cpp

@@ -268,3 +268,10 @@ void cTown::set_item_taken(size_t i, bool val) {
 	if(i >= item_taken.size()) item_taken.resize(i + 1);
 	item_taken.set(i, val);
 }
+
+bool cTown::any_items() const {
+	for(cItem item: preset_items){
+		if(item.code >= 0) return true;
+	}
+	return false;
+}

src/scenario/town.hpp

@@ -115,6 +115,7 @@ public:
 	void set_up_lights();
 	short light_obscurity(short x,short y) const; // Obscurity function used for calculating lighting
 	bool is_cleaned_out() const;
+	bool any_items() const;
 	
 	explicit cTown(cScenario& scenario, size_t dim);
 	void import_legacy(legacy::town_record_type& old);