set, unordered_set, and deque support

[tuero]

I'm not sure if this repo is maintained anymore, but this PR adds support for the standard library std::deque, std::set, and std::unordered_set.

I'd also like to add support for some additional types which I frequently use, and I'm wondering if this is something that would also be wanted, such as std::queue, std::priority_queue, and possibly the standard types for optional and variant. If so:

1. std::queue and std::priority_queue do not allow for random access traversal. As such, the only way I can see an implementation for these types is to create a copy and unpeel the copy to access the internal elements. Would this be an acceptable implementation?
2. std::optional and std::variant require C++17 support. Would this be an issue?

[tuero]

#27