leejo / css-packer-perl / 5

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resolve #1 - fix reference cycle in reggrp closures

replace use of $self in the reggrp_data closures that was causing
the following memory cycle (amongst others):

    Cycle #1
        CSS::Packer A->{_reggrp_comments} => Regexp::RegGrp B
        Regexp::RegGrp B->{_reggrp} => @C
        @C->[4] => Regexp::RegGrp::Data D
        Regexp::RegGrp::Data D->{_replacement} => &E
        closure &E, $self => $F
        $F => CSS::Packer A

now we are using package variables set when minify is called thus
handle any change to the state and remove the cycles

bump VERSION and Changes for CPAN release

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