Summary: Ref T4245. Browsing is huge and currently split across 5 files using controller delegation. Although having a huge file isn't great, I think the way it is split up is currently worse, and it gets weird with more flexible repository identifiers. So this is mostly merging five controllers into one, then a bit of modernization. I think this can probably be split up better by pulling some of it out into views, instead of using delegation. Test Plan: Browsed files, directories, and search results. Reviewers: chad Reviewed By: chad Maniphest Tasks: T4245 Differential Revision: https://secure.phabricator.com/D14942