Ways to present that don’t require an NSError

[ZevEisenberg]

Currently, RZErrorMessenger has methods that take errors, and RaisinToast has utilities for constructing error objects. But many uses of toasts are not related to errors—in fact, quite the opposite. Toasts are often used to display neutral or success messages. The presentation methods should be changed or extended to not be so error-oriented.

cc @markpragma, who had originally mentioned this.