Summary: I've been thinking about this for a while... why not just fold `ArcanistPhutilXHPASTLinter` into `ArcanistXHPASTLinter`?
Test Plan: `arc unit`
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D13867
Summary: Ref T8742. As mentioned in D13512. This still needs some work, but looks roughly how I expect it to. Mainly, I want to move the standards stuff to the linter itself rather than the linter rule. I wanted to push this out for some initial feedback though.
Test Plan: This still needs work.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Maniphest Tasks: T8742
Differential Revision: https://secure.phabricator.com/D13942
