Warn when closing with unsaved encounter changes

include/editor.h

@@ -194,6 +194,7 @@ signals:
     void selectedObjectsChanged();
     void loadMapRequested(QString, QString);
     void tilesetChanged(QString);
+    void wildMonDataChanged();
     void warpEventDoubleClicked(QString mapName, QString warpNum);
     void currentMetatilesSelectionChanged();
     void wheelZoom(int delta);

include/mainwindow.h

@@ -125,6 +125,7 @@ private slots:
     void onMapChanged(Map *map);
     void onMapNeedsRedrawing();
     void onTilesetsSaved(QString, QString);
+    void onWildMonDataChanged();
     void openNewMapPopupWindow(int, QVariant);
     void onNewMapCreated();