Why:
- We want to allow administrators to invoke a CAPTCHA
if an AbuseFilter is configured to do so.
What:
- Implement the AbuseFilterCustomActions hook and define
CaptchaConsequence, which will inform AbuseFilter's implementation
of onConfirmEditTriggersCaptcha that it should show a CAPTCHA
- Deliberately do not register the "showcaptcha" action as a "dangerous
action", because filters that use this action are aimed at bot
traffic, and we don't want a bot to be able to get past the
"showcaptcha" action just by making repeat requests
Soft depends on I110a5f5321649dcf85993a0c209ab70b9886057c
Bug: T20110
Change-Id: Ie87e3d850541c7dc44aaeb6b30489a32a0c8cc60
