Overflow Rerouting System

This commit adds an overflow rerouting system customizable by modifying
the config. If the config values are set, after X amount of clients have
connected, the server will start rerouting all new players to the
configuration "overflow" server. Note that admins are immune to this, and
therefore will not be rerouted under any circumstance. Players that have
already connected and have a body will not be rerouted either, this will
only affect new players that get sent to the lobby.

It probably would also kick players if an admin sent them to the lobby,
but that's a very special case scenario.

code/controllers/configuration.dm

@@ -81,6 +81,7 @@
 	var/forumurl = "http://baystation12.net/forums/"
 
 	var/media_base_url = "http://nanotrasen.se/media" // http://ss13.nexisonline.net/media
+	var/overflow_server_url = "byond://nanotrasen.se:6666"
 
 	var/forbid_singulo_possession = 0
 
@@ -154,6 +155,7 @@
 
 	var/starlight = 0	// Whether space turfs have ambient light or not
 	var/allow_holidays = 0
+	var/player_overflow_cap = 0 //number of players before the server starts rerouting
 
 /datum/configuration/New()
 	var/list/L = typesof(/datum/game_mode) - /datum/game_mode
@@ -508,6 +510,13 @@
 					var/vvalue = text2num(value)
 					config.starlight = vvalue >= 0 ? vvalue : 0
 
+				if("player_reroute_cap")
+					var/vvalue = text2num(value)
+					config.player_overflow_cap = vvalue >= 0 ? vvalue : 0
+
+				if("overflow_server_url")
+					config.overflow_server_url = value
+
 				else
 					diary << "Unknown setting in configuration: '[name]'"