Limit chat spam by announcements

[lokka30]

Contributors wanted - let me know below if you want to work on this!

---

Add a configurable timer. In this timer, chat announcements will not be sent to avoid spam. e.g. the server has a popular period where players are constantly joining, or also bot attacks.

We need to brainstorm what the limit is, and how we will approach it. I think within 1 minute of a record being reached, there should be no further announcements (but still write data down - this is just to limit chat spam). Let me know if you think of any better approach.