Split all 11_meta_yaml.t tests into separate tml files

The original inline YAML/perl that wound up in
t/tml-world/11_meta_yml.tml have been split up.  The remaining tests in
11_meta_yaml.t have been converted from t/data/*.yml files to
t/tml-world/*.tml files with their associated perl data.

Going forward, I hope that any new real world YAML files that are
problems can just get added as .tml files with the expected Perl.