Adds detecting newly made byond accounts (#16269)

* Adds age checking for byond accounts.

* WIP. moved to regex.

* Actually works now.

* local vars

* Changes to use sql.

* Fixes

* Removes unused var

code/modules/client/client defines.dm

@@ -25,7 +25,6 @@
 		///////////////
 	var/ambience_playing= null
 	var/played			= 0
-
 		////////////
 		//SECURITY//
 		////////////

code/modules/client/client procs.dm

@@ -185,6 +185,8 @@ var/next_external_rsc = 0
 	else if (isnum(player_age) && player_age < config.notify_new_player_age)
 		message_admins("New user: [key_name_admin(src)] just connected with an age of [player_age] day[(player_age==1?"":"s")]")
 
+	findJoinDate()
+
 	sync_client_with_db()
 
 	send_resources()