Summary:
Add variable names (`$varname` in `@param type $varname explanation`) to PHPDoc method headers, for fun and profit.
Closes T15923
Test Plan:
* Read the method signatures and their corresponding PHPDoc headers at your fireplace
* Still run `./bin/diviner generate` without explosions (though it is very lenient anyway?)
Reviewers: O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T15923
Differential Revision: https://we.phorge.it/D25799
Summary: Ref T13395. Moves all remaining code in "libphutil/" into "arcanist/".
Test Plan: Ran various arc workflows, although this probably has some remaining rough edges.
Maniphest Tasks: T13395
Differential Revision: https://secure.phabricator.com/D20980
