Add per-account setting to control streaming mode reply behaviour.
* Standard replies mode
* As above + all mentions mode (default)
* All replies from users we follow + all mentions
* All replies super spam mode
Remove now redundant streamapishowallreplies setting.
This sets replies=all and/or filters all incoming streaming API tweets.
Filtered tweets get binned before the proper parsing stage.
Auto-restart any streams if changing the replies=all state.