GitLab

- Reintegrated the other-tags branch into my staging branch.  Local edits were required to integrate with the changes from the event-api branch.

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.

Fixed leak when adding duplicate keys (and actually changed the behavior - now we take the first instance, not the last)

Refactored emitter operator << overloads to not template them, so it's easier to overload for pointer types

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)