Port post notification setting to pref table from 2.0

Signed-off-by: Shitiz Garg <mail@dragooon.net>
Cleanup some topic notification options

Also implement receive body preference for e-mails

Signed-off-by: Shitiz Garg <mail@dragooon.net>
Merge pull request #2249 from Dragooon/notif-cleanup

Some notification cleanup