Use fmt store instead of ToString fallback

Thanks to @jonathanpoelen for the idea

include/Nazara/Core/Format.hpp

@@ -0,0 +1,21 @@
+// Copyright (C) 2023 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_CORE_FORMAT_HPP
+#define NAZARA_CORE_FORMAT_HPP
+
+#include <NazaraUtils/Prerequisites.hpp>
+#include <Nazara/Core/Config.hpp>
+#include <string>
+
+namespace Nz
+{
+	template<typename... Args> std::string Format(std::string_view str, Args&&... args);
+}
+
+#include <Nazara/Core/Format.inl>
+
+#endif // NAZARA_CORE_FORMAT_HPP