'Perl 6' has been renamed as 'Raku'

[SqrtNegInf]

With the recent renaming of 'Perl 6' as 'Raku', there's a need for an update to apply the same highlighting for code with either of those names ('Perl 6' for legacy code, 'Raku' for new code). Is there any way to 'alias' one for the other within GeSHi? Otherwise two identical language files would work.

Additionally: The language file could use some work, I will look into updating it, with the goal of submitting a PR.