Summary:
This makes symbol cross-references work in Differential. You need to do a little
legwork but I'll document that once the change has baked for a little while.
Basically:
- Projects are annotated with indexed languages, and "shared library" projects
(for example, symbols in Phabricator should be searched for in Arcanist and
libphutil).
- When we render a changeset, we check if its language is an indexed one. If
it is, we invoke the decorator Javascript.
- The Javascript takes you to a lookup page, which either gives you a list of
matching symbols (if several match) or redirects you instantly to the
definition.
Test Plan: Clicked class and function symbols in a diff, got jumped into
sensible sorts of places in Diffusion.
Reviewers: jungejason, nh, tuomaspelkonen, aran
Reviewed By: jungejason
CC: aran, jungejason
Differential Revision: 980
