EventLogging opt-out switch

Change-Id: Iffd3ce1be2abd25005fbc1cca08fa3a9af887558
adding edit protection fields

Requires CSS updates in https://gerrit.wikimedia.org/r/#/c/141762/
to get the edit buttons to show broken - has been merged.

Change-Id: I894850b27e18eb150e98ad516b6a93def748c53e
Update W0 flourishes based on UX feedback for MVP.

* Verbiage updates.
* Always show alert for On-to-Off transition, and only have a Dismiss button.
* We may make the fixed element show only intermittently and be tappable, but requires exploration.

Change-Id: I28577334bcba36a4ac6fb5422a24e79afe2ac153
Protect css from being overwritten by zero byte response.

Change-Id: I666d24ed1c53cb3ea63bc853c75cb4fa27295f9a