Allow multi-commands to have their own options.
Review Request #12184 — Created March 21, 2022 and submitted
This renames the existing
common_subcommand_option_list, and re-enables
options for the main commands on the multi-command.
Through this, it's possible to have commands that take their own options
separate from those on subcommands.
We also inject global options, ensuring that
rbt <maincommand> --help
rbt reviewstill functioned correctly.
rbt review --help
now shows standard options, and subcommands are all sharing the common ones.