Replace positional parameters in constructors

[Michael Zedeler]

Constructors should not use positional parameters and in stead use hash a hash glob to eat up all optional parameters.

Example:

$transformer = new DS::Some::Transformer( $in_type, $out_type, undef, $out );

with mandatory parameter $in_type, optional parameters $out_type, $in (undef in the example above) and $out becomes

$transformer = new DS::Some::Transformer( $in_type, out_type =>$out_type, out = $out );