project: implemented autorecovery core

Not done yet, but nearly.

app/task/project/save/save.h

@@ -37,12 +37,19 @@ public:
     return project_;
   }
 
+  void SetOverrideFilename(const QString& filename)
+  {
+    override_filename_ = filename;
+  }
+
 protected:
   virtual bool Run() override;
 
 private:
   Project* project_;
 
+  QString override_filename_;
+
 };
 
 }