Allow Diviner groups to be configured in `.book` files
Summary:
Ref T988. Currently, every class/function needs to be annotated with `@group`, but 99% of this data can be inferred from file structure, at least in this project. Allow group specifications like:
"paste" : {
"name" : "Paste",
"include" : "(^src/applications/paste/)"
}
..to automatically put everything defined there in the "paste" group. A list of regexps is also supported. Depends on D6855.
Test Plan: Regenerated documentation with `bin/diviner generate --book src/docs/book/phabricator.book --clean`, observed all Paste stuff go in the paste group.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T988
Differential Revision: https://secure.phabricator.com/D6856