Options to control how git_status_foreach_ext() will issue callbacks.

This structure is set so that zeroing it out will give you relatively sane defaults.

The show value is one of the git_status_show_t constants that control which files to scan and in what order.

The flags value is an OR'ed combination of the git_status_opt_t values above.

The pathspec is an array of path patterns to match (using fnmatch-style matching), or just an array of paths to match exactly if GIT_STATUS_OPT_DISABLE_PATHSPEC_MATCH is specified in the flags.