[MIRROR] Remove all gamemodes except Dynamic (#5173)

* Remove all gamemodes except Dynamic

* qaaaaaaaa

Co-authored-by: Mothblocks <35135081+Mothblocks@users.noreply.github.com>
Co-authored-by: Gandalf <jzo123@hotmail.com>

code/modules/client/client_procs.dm

@@ -1146,3 +1146,18 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 		SSambience.ambience_listening_clients[src] = world.time + 10 SECONDS //Just wait 10 seconds before the next one aight mate? cheers.
 	else
 		SSambience.ambience_listening_clients -= src
+
+/// Checks if this client has met the days requirement passed in, or if
+/// they are exempt from it.
+/// Returns the number of days left, or 0.
+/client/proc/get_remaining_days(days_needed)
+	if(!CONFIG_GET(flag/use_age_restriction_for_jobs))
+		return 0
+
+	if(!isnum(player_age))
+		return 0 //This is only a number if the db connection is established, otherwise it is text: "Requires database", meaning these restrictions cannot be enforced
+
+	if(!isnum(days_needed))
+		return 0
+
+	return max(0, days_needed - player_age)