Do away with semver, move to day versions

[rwxrob]

As with JSON schema moving to 2023-01 style versions is more relevant than trying to assert significance through semantic versioning. Indeed, in many ways semver has failed on its promise and been widely abused by the software industry. Most significantly, most major projects refuse to give anything created a major version based on the expectations outlines in the semver specification. We see widespread use of only minor versions some of which have breaking changes, and others that do not. For PEGN grammars it is better to assume every change is a breaking change and promote examination of the new specification closely for each individual to decide whether to adopt it or not, such has been the decision justification behind the move to dated versions for JSON schema and other specifications.