Added three utilities for admins & developers

- There is a new option in the player panel labeled "Send back to
   Lobby", which will send a given player back to the lobby.
 - The player panel also has a shortcut to the "Spawn Character" verb.
 - Finally, there's a new config option that disables the warning
   message about multikeying if two mobs with the same CID are found;
   this option should NOT be enabled if multikeying is prohibited by the
   server rules. It is simply a developer tool, as multikeying is
   sometimes necessary to test new features that require two clients
   interacting.

code/controllers/configuration.dm

@@ -264,6 +264,10 @@ var/list/gamemode_cache = list()
 	var/sqlite_feedback_cooldown = 0 // How long one must wait, in days, to submit another feedback form. Used to help prevent spam, especially with privacy active. 0 = No limit.
 	var/sqlite_feedback_min_age = 0 // Used to block new people from giving feedback. This metric is very bad but it can help slow down spammers.
 
+	// disables the annoying "You have already logged in this round, disconnect or be banned" popup for multikeying, because it annoys the shit out of me when testing.
+	var/disable_cid_warn_popup = FALSE
+
+
 /datum/configuration/New()
 	var/list/L = typesof(/datum/game_mode) - /datum/game_mode
 	for (var/T in L)
@@ -873,7 +877,8 @@ var/list/gamemode_cache = list()
 				if("sqlite_feedback_cooldown")
 					config.sqlite_feedback_cooldown = text2num(value)
 
-
+				if("disable_cid_warn_popup")
+					config.disable_cid_warn_popup = TRUE
 
 				else
 					log_misc("Unknown setting in configuration: '[name]'")