Make minor, non-user-visible changes to how we structure the probs
package. Notably:
- Add new problem types for UnsupportedContact and
UnsupportedIdentifier, which are specified by RFC8555 and which we will
use in the future, but haven't been using historically.
- Sort the problem types and constructor functions to match the
(alphabetical) order given in RFC8555.
- Rename some of the constructor functions to better match their
underlying problem types (e.g. "TLSError" to just "TLS").
- Replace the redundant ProblemDetailsToStatusCode function with simply
always returning a 500 if we haven't properly set the problem's
HTTPStatus.
- Remove the ability to use either the V1 or V2 error namespace prefix;
always use the proper RFC namespace prefix.
Aaron Gable
Jacob Hoffman-Andrews
Roland Bracewell Shoemaker
Roland Bracewell Shoemaker