* refactor(REST): remove double classing
BREAKING CHANGE: `REST` and `RequestManager` have been combined, most of the properties, methods, and events from both classes can now be found on `REST`
BREAKING CHANGE: `REST#raw` has been removed in favor of `REST#queueRequest`
BREAKING CHANGE: `REST#getAgent` has been removed in favor of `REST#agent`
* chore: update for /rest changes