add File>Reload Project

include/mainwindow.h

@@ -42,6 +42,7 @@ public slots:
 
 private slots:
     void on_action_Open_Project_triggered();
+    void on_action_Reload_Project_triggered();
     void on_mapList_activated(const QModelIndex &index);
     void on_action_Save_Project_triggered();
     void openWarpMap(QString map_name, QString warp_num);

include/project.h

@@ -64,6 +64,9 @@ public:
 
     void set_root(QString);
 
+    void clearMapCache();
+    void clearTilesetCache();
+
     struct DataQualifiers
     {
         bool isStatic;