Adds plugin to support Perl::Tidy::Sweetened

Perl::Tidy::Sweetened is a code tidier, built on Perl::Tidy, that
supports the new syntactic sugar for OO and method signatures as
provided by L<Method::Signature::Simple>, L<MooseX::Method::Signatures>
and the p5-mop. 

This patch creates a plugin to support Perl::Tidy::Sweetened 
under Code::TidyAll.

Thanks,
Mark

You need to add a blank line after the package statement for the benefit of dzil.