Add a wp_list_users() template tag

[greenshady]

Now that get_users() has been implemented (#14572), I propose we add a function called wp_list_users() that handles a basic list of users similar to wp_list_authors(). WordPress has long needed a function for handling this.

The arguments for the function would simply be the same arguments used for get_users(). The wp_list_users() function would basically be a function for outputting the HTML. The function should also have the ability to link to the user's archive page and output a link to the user's RSS feed.

This would make it easy for theme developers and users to be able to create a users list without a lot of PHP work.

An alternate idea might be to push a few more arguments into the wp_list_authors() function, but I don't think that's the best route to go since its primary function is to list users that have written posts.