[Standards] XEP 85 "gone" and "inactive" state

[Remko Tronçon]

> I strongly suggest removing the recommendations to change chat states
> by arbitrary client-determined timeouts and changing them only to
> reflect the user's interaction with the client:
> active - the conversation window is focused
> inactive - the conversation window is not not focused
> gone - the conversation window is closed
> composing and paused - keep the same

Weird, I didn't even realize the XEP talked about timeouts, because I
implemented it the way you described it (although i think i used
inactive for 'minimized', because losing focus happens a lot).

cheers,
Remko