- moved the ->parameterize tests to own test suite

- moved the ->parameterize tests to own test suite
- changed  t/030_roles/017_extending_role_attrs.t to deal with the fact we sort
  union type constraints
- removed ugly hack from ->parameterize to force a tc name
- union types now sort @TC and properly canonicalize their names
- changed the regex parsing for stringed type constraints so that we ignore
  pointless whitespace and have support for upcoming structured types