Add a toggle to the typing chat overlay

[zjdtmkhzt]

I don't think adding a toggle for this is a good idea, seeing as it would be kind of powergamey to switch it on, and it'd be kind of weird to have it on some people and not others.

Personally, I don't see the issue with people attacking while someone is typing, it's been a strategy before this change, and it makes sense that appearing friendly at first may catch someone off their guard. If the person is already suspicious, they'll be able to close their chat window very quickly.