Add player authentication backend.

OpenRA.Game/Settings.cs

@@ -59,6 +59,9 @@ namespace OpenRA
 		[Desc("Takes a comma separated list of IP addresses that are not allowed to join.")]
 		public string[] Ban = { };
 
+		[Desc("If non-empty, only allow authenticated players with these user IDs to join.")]
+		public int[] RequireAuthIDs = { };
+
 		[Desc("For dedicated servers only, controls whether a game can be started with just one human player in the lobby.")]
 		public bool EnableSingleplayer = false;
 
@@ -183,6 +186,9 @@ namespace OpenRA
 
 		public bool AllowDownloading = true;
 
+		[Desc("Filename of the authentication profile to use.")]
+		public string AuthProfile = "player.oraid";
+
 		public bool AllowZoom = true;
 		public Modifiers ZoomModifier = Modifiers.Ctrl;