Added aliase for weak ptr

Nuake/src/Core/Core.h

@@ -12,6 +12,8 @@ using Ref = std::shared_ptr<T>;
 template<typename T>
 using Scope = std::unique_ptr<T>;
 
+template<typename T>
+using Weak = std::weak_ptr<T>;
 
 template<typename T, typename ... Args>
 constexpr Ref<T> CreateRef(Args&& ... args)
@@ -23,4 +25,4 @@ template<typename T, typename ... Args>
 constexpr Scope<T> CreateScope(Args&& ... args)
 {
 	return std::make_unique<T>(std::forward<Args>(args)...);
-}
+}