Make notice boards persist through rounds

[kyle2143]

That does seem pretty fun. Like polivilas said though, gotta do something about too many notes.

I'm not sure how notes there work now. But we could restrict the characters in a note to something short, and maybe only allow new notes to be posted every few minutes or once a round. Then when it get's to a certain size or maybe on round end, we could save that data for next round and put it on goonhub or something.