[Messages] Add GM Status and Invulnerability Messages (#4266)

* [Messages] Add GM Status and Invulnerability Messages

* Update zoning.cpp

* Finalize.

* Update corpse.cpp

* Update message

---------

Co-authored-by: Akkadius <akkadius1@gmail.com>

zone/tasks.cpp

@@ -123,6 +123,10 @@ bool Client::HasTaskRequestCooldownTimer()
 		task_request_timer.Disable();
 	}
 
+	if (GetGM()) {
+		Message(Chat::White, "Your GM Flag prevents you from having a task request cooldown.");
+	}
+
 	return (!GetGM() && task_request_timer.Enabled());
 }