DolphinQt: add a 'add to watch' context menu item that allows you to add a memory location found in a cheat search to be added to the watch list

Source/Core/DolphinQt/CheatsManager.h

@@ -36,6 +36,7 @@ public:
 signals:
   void OpenGeneralSettings();
   void ShowMemory(u32 address);
+  void RequestWatch(QString name, u32 address);
 
 private:
   void CreateWidgets();