Notification control center

The general idea is to have detailed notifications controls. Basically have a matrix like this:

	Sound (#139)	Push	Non-push	Notifications column	Auto-read
Mention	doom_chat.ogg	x	x	x
Favorite			x	x	x
Repeat		x	x	x	x
Follow	oof.ogg		x	x	x

Instead of 4 checkboxes that there are now in user settings