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 around the UI a bit. I'm expecting the whitespace changes to get some more iteration this week so I not being hugely pedantic about testing this stuff exhaustively.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13161, T3498

Differential Revision: https://secure.phabricator.com/D20185