Client BYOND account creation date tracking (#14733)

* Client BYOND account creation date tracking

* Mochi suggestion

* Tweaks

code/controllers/configuration.dm

@@ -250,6 +250,9 @@
 	// Makes gamemodes respect player limits
 	var/enable_gamemode_player_limit = 0
 
+	/// BYOND account age limit for notifcations of new accounts (Any accounts older than this value will not send notifications on first join)
+	var/byond_account_age_threshold = 7
+
 /datum/configuration/New()
 	for(var/T in subtypesof(/datum/game_mode))
 		var/datum/game_mode/M = T
@@ -741,6 +744,8 @@
 					config.disable_localhost_admin = 1
 				if("enable_gamemode_player_limit")
 					config.enable_gamemode_player_limit = 1
+				if("byond_account_age_threshold")
+					config.byond_account_age_threshold = text2num(value)
 				else
 					log_config("Unknown setting in configuration: '[name]'")