Use fmt store instead of ToString fallback

Thanks to @jonathanpoelen for the idea

src/Nazara/Core/Format.cpp

@@ -0,0 +1,53 @@
+// 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
+
+#include <Nazara/Core/Format.hpp>
+#include <fmt/args.h>
+#include <fmt/format.h>
+#include <fmt/std.h>
+#include <Nazara/Core/Debug.hpp>
+
+namespace Nz
+{
+	namespace Detail
+	{
+		thread_local fmt::dynamic_format_arg_store<fmt::format_context> s_formatStore;
+
+		void ClearFormatStore()
+		{
+			s_formatStore.clear();
+		}
+
+		std::string FormatFromStore(std::string_view str)
+		{
+			return fmt::vformat(str, s_formatStore);
+		}
+
+#define NAZARA_FORMAT_IMPLEM(Type) \
+		template<> NAZARA_CORE_API void PushFormatArgImpl(Type const& value) \
+		{ \
+			s_formatStore.push_back(value); \
+		}
+
+		NAZARA_FORMAT_IMPLEM(std::filesystem::path);
+		NAZARA_FORMAT_IMPLEM(std::string);
+		NAZARA_FORMAT_IMPLEM(std::string_view);
+		NAZARA_FORMAT_IMPLEM(const char*);
+		NAZARA_FORMAT_IMPLEM(short);
+		NAZARA_FORMAT_IMPLEM(int);
+		NAZARA_FORMAT_IMPLEM(long);
+		NAZARA_FORMAT_IMPLEM(long long);
+		NAZARA_FORMAT_IMPLEM(unsigned short);
+		NAZARA_FORMAT_IMPLEM(unsigned int);
+		NAZARA_FORMAT_IMPLEM(unsigned long);
+		NAZARA_FORMAT_IMPLEM(unsigned long long);
+		NAZARA_FORMAT_IMPLEM(float);
+		NAZARA_FORMAT_IMPLEM(double);
+		NAZARA_FORMAT_IMPLEM(long double);
+
+#undef NAZARA_FORMAT_IMPLEM
+	}
+
+#undef NAZARA_TO_STRING_CPP_SPEC
+}