http://perldoc.perl.org/perldata.html#Scalar-value-constructors -> Special Literals
… was causing problems in the atom version of the syntax
Added a list of known built-in functions based off the list of supported functions specified in vim-perl perl6.vim s:builtins. Also added a basic set of variable matches. It has some known issues, for instance it doesn't match all known twigils or adverbs and has trouble understanding unicode and << and « in variable names.