Enable animated avatars setting (#4040)

* feat: Add user setting for toggling avatar gif animations

* Add forgotten post listing mode option to settings form

* Fix compilation error

* Fix formatting

* Change name of column to be more general purpose

* Fix sql format.

* Fix comments

* Running format.

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Co-authored-by: Dessalines <tyhou13@gmx.com>
Co-authored-by: Dessalines <dessalines@users.noreply.github.com>