mark unsaved changes to map for heaeder and event edits

closes #305
closes #337
closes #347

include/core/map.h

@@ -53,6 +53,7 @@ public:
     QMap<QString, QString> customHeaders;
     MapLayout *layout;
     bool isPersistedToFile = true;
+    bool hasUnsavedDataChanges = false;
     bool needsLayoutDir = true;
     QImage collision_image;
     QPixmap collision_pixmap;

include/editor.h

@@ -210,6 +210,7 @@ signals:
     void warpEventDoubleClicked(QString mapName, QString warpNum);
     void currentMetatilesSelectionChanged();
     void mapRulerStatusChanged(const QString &);
+    void shouldUpdateWindow();
 };
 
 #endif // EDITOR_H