Allow custom hyperlinks; Pass differential.diff-id into remarkup engine config
Summary: This allows extensions to have more options for generating custom
hyperlinks.
Test Plan:
custom-inline rules are moved before default rules. Test existing products which
implement custom rules.
Make sure you use "$this->getEngine()->storeText()" in rules.
Reviewers: epriestley, jungejason
Reviewed By: jungejason
CC: aran, epriestley, emiraga, jungejason
Differential Revision: 1024