save on exit message, * symbol on unsaved docs, saved status on history

engine/app.h

@@ -64,7 +64,7 @@ public:
     Node* current_panel = nullptr;
     NodeScroll* panels;
     const uint16_t main_id = const_hash("main");
-    std::string doc_name;
+    std::string doc_name = "no-name";
     float width;
     float height;
     bool keys[256];
@@ -155,7 +155,7 @@ public:
     std::shared_ptr<NodeProgressBar> show_progress(const std::string& title);
 
     void brush_update();
-    void title_update(std::string name, int resolution);
+    void title_update();
     void update_memory_usage(size_t bytes);
     void update_rec_frames();