[WIP] [TODO] support proper DFS

[timotheecour]

• [ ] do not pull until i remove [WIP]

partially address https://github.com/citycide/glob/issues/9

echo listGlob("tests/t48_glob/a", includeDirs=true).join("\n")

now gives a proper DFS order:

tests/t48_glob/a
tests/t48_glob/a/b0.txt
tests/t48_glob/a/b1
tests/t48_glob/a/b1/c2.txt
tests/t48_glob/a/b1/c1.txt
tests/t48_glob/a/b3.txt
tests/t48_glob/a/b2
tests/t48_glob/a/b2/c1.txt

instead of the previous scrambled order:

tests/t48_glob/a/b2
tests/t48_glob/a/b3.txt
tests/t48_glob/a/b1
tests/t48_glob/a/b0.txt
tests/t48_glob/a/b1/c1.txt
tests/t48_glob/a/b1/c2.txt
tests/t48_glob/a/b2/c1.txt

• [ ] support optional sort param (which would only sort walkDir output, not the whole thing) ; this would allow automagically generating sorted output on the entire output without having to sort explicitly the entire output (I can explain if unclear):

  tests/t48_glob/a
  tests/t48_glob/a/b0.txt
  tests/t48_glob/a/b1
  tests/t48_glob/a/b1/c1.txt
  tests/t48_glob/a/b1/c2.txt
  tests/t48_glob/a/b2
  tests/t48_glob/a/b2/c1.txt
  tests/t48_glob/a/b3.txt

[haltcase]

@timotheecour I'm going to close this since it's been 6 months and there have been quite a few changes to the library, so I'm assuming this would need a fair bit of rework. Feel free to come back to it any time.