1fcb59104d
Ultimately, we want to add support for GDM's need ChoiceList PAM extension. That extension allows PAM modules to present a list of choices to the user. Before we can support that extension, however, we need to have a list control in the login-screen/unlock screen. This commit adds that control. For the most part, it's a copy-and-paste of the gdm userlist, but with less features. It lacks API specific to the users, lacks the built in timed login indicator, etc.