Fix anchor reference issue in Map keys

[buty4649]

This PR fixes a bug where an extra colon : is appended to the anchor reference name when used in Map keys.

Reproduction Steps

Parsing the following ng.yaml with ./tools/ryml-yaml-events results in an error.

$ cat ng.yaml
abc: &foo FOO
*foo: bar

$ ./build/tools/ryml-yaml-events ng.yaml
ng.yaml:2:7: (20B): ERROR: could not find ':' colon after key
ng.yaml:2:7: *foo: bar  (size=9)
                   ^~~  (cols 7-10)

[biojppm]

TLDR; the problem is with your YAML, not with the library.

---

Sorry, but the existing behavior is correct, and adheres to the standard.

An anchor can legally have a trailing semicolon, so the semicolon immediately after a reference is understood as part of the reference. It is what it is.

See example with space and the same example without space.

FYI, before the recent release, rapidyaml was incorrect; this was fixed and that's why you now see the problem with this release.

[buty4649]

Thank you for your reply and for explaining the details of the specification. I wasn't aware that an anchor could legally include a :. I had misunderstood because libyaml does not allow a : in this context.

As you pointed out, my changes are against the YAML specification, so I will close this PR.