GitLab

Renamed the base64 methods, and switched the EncodeBase64 one to return a string (to make it easy to use elsewhere)

Refactored the base64 binary to its own space with a unified class that (will) be used for parsing (in addition to emitting)

Updated new API conversion to handle nan/inf and to throw when the conversion didn't use the entire string (e.g., parsing 1.2 as an integer)