As discussed in pleroma-meta#2

This reverts commit eb9aa7aa, reversing
changes made to c4fbb569.

This reverts commit fe7fd331, reversing
changes made to 4fabf83a.

This reverts merge request !1653

as read and make it respond with Mastoapi entities

in 300d94c6, an Object.normalize() call was introduced.  calling Object.normalize()
on an activity with a non-object URI (say, a user) causes Really Bad Things to happen.
so don't do that.

Also in this commit by accident:
- Fix query ordering causing exclude_poll_votes to not work
- Do not create notifications for Answer objects

Allow users to configure whether they want to receive notifications from people they follow / who follow them, people from remote / local instances

notifications.

Unify Mastodon-compatible pagination logic.