Persistence feature for Universal access

Originally created by @sajolida on #7260 (Redmine)

GNOME 3 introduces a Universal access utility that allows to configure many small accessibility features from a single interface. It would make much sense to have those settings remembered in persistence.

https://help.gnome.org/users/gnome-help/stable/a11y.html

Related issues

Related to #7500 (closed)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information