REPL6: move linenoise and readline mixing in into subs
REPL6: move linenoise and readline mixing in into subs

This is to make the code cleaner, but also to to pave the
way for changing the line editor load order more easily

tbrowder/rakudo,Gnouc/rakudo,raydiak/rakudo,awwaiid/rakudo,labster/rakudo,nbrown/rakudo,tbrowder/rakudo,lucasbuchala/rakudo,labster/rakudo,zostay/rakudo,samcv/rakudo,labster/rakudo,usev6/rakudo,azawawi/rakudo,jonathanstowe/rakudo,salortiz/rakudo,Gnouc/rakudo,samcv/rakudo,samcv/rakudo,zostay/rakudo,tony-o/rakudo,usev6/rakudo,lucasbuchala/rakudo,jonathanstowe/rakudo,raydiak/rakudo,MasterDuke17/rakudo,salortiz/rakudo,labster/rakudo,salortiz/rakudo,sjn/rakudo,jonathanstowe/rakudo,nbrown/rakudo,rakudo/rakudo,tony-o/rakudo,raydiak/rakudo,sjn/rakudo,sjn/rakudo,azawawi/rakudo,awwaiid/rakudo,labster/rakudo,b2gills/rakudo,Gnouc/rakudo,rakudo/rakudo,rakudo/rakudo,nbrown/rakudo,b2gills/rakudo,sjn/rakudo,lucasbuchala/rakudo,b2gills/rakudo,rakudo/rakudo,usev6/rakudo,MasterDuke17/rakudo,azawawi/rakudo,softmoth/rakudo,tony-o/rakudo,salortiz/rakudo,Gnouc/rakudo,azawawi/rakudo,nbrown/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,raydiak/rakudo,labster/rakudo,rakudo/rakudo,MasterDuke17/rakudo,tony-o/rakudo,b2gills/rakudo,b2gills/rakudo,tbrowder/rakudo,tony-o/rakudo,Gnouc/rakudo,awwaiid/rakudo,salortiz/rakudo,zostay/rakudo,softmoth/rakudo,MasterDuke17/rakudo,softmoth/rakudo,sjn/rakudo,tbrowder/rakudo,tbrowder/rakudo,tony-o/rakudo,softmoth/rakudo,usev6/rakudo,MasterDuke17/rakudo,nbrown/rakudo,nbrown/rakudo,Gnouc/rakudo,usev6/rakudo,zostay/rakudo,azawawi/rakudo,rakudo/rakudo,salortiz/rakudo,lucasbuchala/rakudo,awwaiid/rakudo,jonathanstowe/rakudo,samcv/rakudo,jonathanstowe/rakudo,softmoth/rakudo,awwaiid/rakudo,samcv/rakudo,lucasbuchala/rakudo