~lambdas: Add Raku language tests (formerly Perl 6)

[softmoth]

Replaces #91. In the interim since that pull request was created, Perl 6 was renamed to Raku.

[Danappelxx]

I don't know perl 6 very well, so unfortunately I can't review this PR for correctness. If someone else can review this, would be great.

Alternatively, we can wait until we have CI set up which can actually test the spec against your implementation.

[softmoth]

Thanks, Danappelxx. Aside from the perl6 to raku rename, this is the same exact lambda tests that have been running on raku-Template-Mustache for years. So it is safe to use. I will push an update to raku-Template-Mustache to refer to the official repo w/ the raku naming as soon as I fix the sections.yml tests, which have two new checks that raku-Template-Mustache doesn't pass. But that should be considered independent of this PR.

Thank you!

Tim (aka softmoth)

[softmoth]

I've pushed a new version that fixes the bug exposed by #114 (great to have new test cases) and includes this PR's version of ~lambdas.json. You can verify its success at https://travis-ci.org/softmoth/raku-Template-Mustache . Again, this has been tested thousands of times over the years by the Raku user base; the 'perl6' to 'raku' change is the only new thing. I hope that helps.

Kind regards,

Tim

[Danappelxx]

Fantastic! Thank you for your contribution.