R1:5310f1cdd90e

Remove all whitespace options/configuration everywhere

Summary:
Depends on D20181. Depends on D20182. Fixes T3498. Ref T13161. My claim, at least, is that D20181 can be tweaked to be good enough to throw away this "feature" completely.

I think this feature was sort of a mistake, where the ease of access to `diff -bw` shaped behavior a very long time ago and then the train just ran a long way down the tracks in the same direction.

Test Plan: Grepped for `whitespace`, deleted almost everything. Poked…