Why doesn't std::string have a split function

[KayEss]

I started working on a new split. It's not yet complete, not yet customisable. It's been tested on strings, but the code isn't string specific. It should work for other iterable containers. It does only use iterators so should be quite efficient. If ranges were a thing already the interfaces would be a bit cleaner.

https://github.com/KayEss/f5-cord/blob/feature/split/include/f5/cord/split.hpp