Adaptive slowmode for active users

Fluxer HQ's chat needs a high slowmode to prevent spam, but it can limit the ease of chatting for people who are actually discussing Fluxer.

Optionally, new chatters will have a high slowmode (ex: 30 seconds), but then if they have been chatting for a few minutes and seem like they wont be spamming, they will go down to a lower slowmode (ex: 8 seconds). This should make it easier for people having good discussion to chat.