added virtual destuctor for menu things

lib/Menu/menu.cpp

@@ -14,6 +14,11 @@ Menu::Menu() {
     this->selectedEntry = this->entrys.begin();
 }
 
+Menu::~Menu() {
+    for (std::list<MenuAction*>::iterator iter = this->entrys.begin(); iter != this->entrys.end(); iter++)
+        delete *iter;
+}
+
 void Menu::addEntry(MenuAction* entry) {
     this->entrys.push_back(entry);