Configure Notification Levels per room (not working atm)

[rmsthebest]

As mentioned in the issue #304, I couldn't find a way to set notification options.

Here is an attempt to implement it. It isn't working, I'm not sure why so help is appreciated.

I apologize for breaking formatting, maybe my editor isnt picking up the rustfmt.toml from the repo? If we get this working we can fix that later