made the alien player limit a config option

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>

code/modules/mob/new_player/new_player.dm

@@ -455,11 +455,11 @@
 		src << browse(null, "window=latechoices") //closes late choices window
 		src << browse(null, "window=playersetup") //closes the player setup window
 
-#define MAX_ALIEN_PLAYER_PERCENT 20
-
-//cael - this should probably be moved to ticker or somewhere, but it's fine here for now
 //limits the number of alien players in a game
 /proc/GetAvailableAlienPlayerSlots()
+	if(!config.limitalienplayers)
+		return 9999
+
 	var/num_players = 0
 
 	//check new players
@@ -472,4 +472,4 @@
 		if(H.ckey)
 			num_players++
 
-	return round(num_players * (MAX_ALIEN_PLAYER_PERCENT / 100))
+	return round(num_players * (config.alien_to_human_ratio / 100))