Term::ANSIColor color localization patch

the attached allows color tags to stack up, so instead of
resetting to nothing,
one can have a color set, as long as it was set like so

     use Term::ANSIColor ':pushpop';

      print PUSHCOLOR(RED.ON_BLUE),"this will be in red
on bluen";

then give

       print LOCALCOLOR(BLUE.ON_RED,"yatta ta da, ta
da");

and due to the manipulation of Term::ANSIColor::COLORSTACK
by
the new features in the patch, the localcolor text is in the
localcolor but
afterwards

     print "this will again be red on blue with no
additional effort."

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