Use fmt store instead of ToString fallback

Thanks to @jonathanpoelen for the idea

include/Nazara/Core/Format.inl

@@ -0,0 +1,41 @@
+// 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
+
+#ifdef NAZARA_BUILD
+#include <fmt/format.h>
+#include <fmt/std.h>
+#endif
+
+#include <Nazara/Core/Debug.hpp>
+
+namespace Nz
+{
+	namespace Detail
+	{
+		NAZARA_CORE_API void ClearFormatStore();
+		template<typename T> void PushFormatArgImpl(const T& value);
+		template<typename T> void PushFormatArg(T&& value)
+		{
+			PushFormatArgImpl(static_cast<const std::decay_t<T>&>(value));
+		}
+
+		NAZARA_CORE_API std::string FormatFromStore(std::string_view str);
+	}
+
+	template<typename ...Args>
+	std::string Format(std::string_view str, Args&&... args)
+	{
+#ifdef NAZARA_BUILD
+		return fmt::format(str, std::forward<Args>(args)...);
+#else
+		Detail::ClearFormatStore();
+		(Detail::PushFormatArg(args), ...);
+		return Detail::FormatFromStore(str);
+#endif
+	}
+
+#undef NAZARA_TO_STRING_STD_SPEC
+}
+
+#include <Nazara/Core/DebugOff.hpp>