Update serializer to use C++17 standard

[yuhc]

The imported serializer uses C++14 standard. I'd be good to upgrade it to comply C++17. This can also improve the performance of registering polymorphic types which can be slower in C++14 compared to C++17 due to the use of shared_timed_mutex instead of shared_mutex.

[yuhc]

https://github.com/eyalz800/serializer/issues/10