Task: Write a TAP v12 formatter for Test::Builder1.5

I have an important task for getting Test::Builder 1.5 stable.

Test::Builder 1.5 outputs TAP version 13.  There are minor formatting changes
including a TAP version header and changes to the ending commentary.

A lot of tests look at this output and so they break.  Rather than make
everybody change their tests (and have to upgrade their Test::More
dependency), I'd rather provide a legacy TAP formatter that outputs like
Test::Builder currently does.  Then folks can switch it on in their tests, and
Test::Builder::Tester will use it by default.

That's the task.  Write a TAP version 12 formatter.
https://github.com/schwern/test-more/issues/215
https://github.com/schwern/test-more/wiki/Preferred-workflow

It's a mildly difficult task, mostly because the v13 formatter does things
which really should be done in a superclass, but it's way easier than trying
to do it in Test::Builder 0.x.

If anyone would like to take it on, please say so in the ticket and we'll try
to get things off the ground.

Thanks.


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