Puzzle 19: Add an "exhaustive" build strategy.

As expected, the explosion in permutations makes this prohibitive.

With this stragegy, on Blueprint 2 of the test input, for:
  10 rounds it takes   0.018s/59,979 iterations
  11 rounds it takes   0.070s/1,257,483 iterations
  12 rounds it takes   1.292s/59,156,010 iterations
  13 rounds it takes 3m2.770s/8,395,942,157 iterations

Getting to 24 rounds just isn't feasible with that growth.

And I can't figure out how to cull unwanted permutations easily.

Going to have to try something else.

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