Merge branch 'ps/refs-writing-subcommands'

The 'git refs' toolbox has been extended with new 'create', 'delete', 'update', and 'rename' subcommands to create, delete, update, and rename references, respectively. * ps/refs-writing-subcommands: builtin/refs: add "rename" subcommand builtin/refs: add "create" subcommand builtin/refs: add "update" subcommand builtin/refs: add "delete" subcommand builtin/refs: drop `the_repository`