Rename 'run options' to 'runner settings' and use them a bit more...

Rename 'run options' to 'runner settings' and use them a bit more consistently: move 'class' and 'fetcher_class' into them. (Meaning you can theoretically call drunkins_run_start() to run a queue job without defining config in an info hook.) hook_queue_info() definitions now have a 'runner_settings' section but for the rest, code behavior should not have changed.