ChannelLogger: set FlushImmediately to True.

* This is default behaviour with ZNC and some other IRC related applications.
* Users are often confused when the logs don't appear.
* The logs will less likely get lost if they are written immediately.
* Gribble is doing this too (but not by default).
Relay: set NoticeNonPrivmsgs to True.

Please see https://github.com/TkTech/notifico/issues/79

* > There is a difference between a NOTICE to a channel and a NOTICE to a user, every client should be able to correctly display notices to a channel. ~~ @Dav1dde

* > They should, but they don't. ~~ @Mkaysi

* > That's besides the point. There are a lot of clients that do handle it properly, and if they don't then that's not notifico's fault, that's their own fault. ~~ @sckasturi
Revert "Relay: set NoticeNonPrivmsgs to True."

This reverts commit cc8f96eeaca9dd0209e1ba1bc1aeb3dcfd4bc135.