Move more globals into the global $self

Move more globals into the global $self

Move $proto_re, $Overload, $errors, $Fallback, $hiertype,
$WantPrototypes, $WantVersionChk, $WantLineNumbers,
$filepathname, $dir, $filename, $BLOCK_re, $lastline, $lastline_no
into $self. $proto_re not used within ParseXS.pm, so remove it.
$FH did not play well with $self inside angle-bracket operator
(while loop). $Package could not be transformed either, probably
due to problems in its usage as ${Package} inside HEREdocs.