GitLab

Updated to remove most of the warnings in Visual Studio. (There's still the one about all control paths returning a value left.) Fixed one warning (when an istream converts to void * to then convert to bool), and disabled three.

Refactored the traits a bit, and added displaying the key to string and numeric key not found errors

Fixed the return value of the integral conversion functions, and also unset the dec flag so it reads other bases (just a temporary fix, since we're officially supposed to read binary too)

Refactored the operator >> and Node::Read default functions, as well as the conversion functions, to more easily read new types as keys (this uncovered an error, in example 2.11 of the spec)

It's better organized now, I think - nodes only offer a single main way of getting the fundamental scalar (as a string), and now we can specialize a single template to read specific types.