Canonical: Add the ability to disable redirect_guess_404_permalink().
This also adds a few more filters to make adding redirects easier. Notably:
1. `do_redirect_guess_404_permalink`
2. `pre_redirect_guess_404_permalink`
3. `strict_redirect_guess_404_permalink`
Fixes: #16557.
Props: msafi, nacin, simonwheatley, westi, mboynes, joostdevalk, Lex_Robinson, MikeSchinkel, haukep, paulschreiber, DrewAPicture, ravenswd, esemlabel, stevegibson12, martychc23, DrLightman, jivanpal, neonkowy, laternastudio, apedog, audrasjb, davidbaumwald, Confridin, donmhico, ryotsun.
git-svn-id: https://develop.svn.wordpress.org/trunk@47878 602fd350-edb4-49c9-b593-d223f7449a82
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