9.16 Disabled cross-team chat

MrConway: I will also miss the occasional banter with the enemy team, but lets face it, often it is the cause of a lot of toxicity.   We tried different approaches over the years, from getting players to send tickets to implementing the reporting system with escalating suspensions. Unfortunately, even though it helped, it was not enough.   If you think that this really is a very bad decision, please provide us this feedback, no decisions are irreversible. I do however think that this will ultimately mean a nicer atmosphere in random games.