Draft: Add mouse scrolling speed configuration

Ruby Kloverrequested to merge
warningnonpotablewater/gnome-control-center:better-scroll-speed into main

This commits adds Wayland-only scrolling speed configuration provided by mutter!1840.

Screenshot_from_2021-05-19_15-49-23

Screenshot_from_2021-05-19_15-49-49

Fixes #379

Edited by Robert Ancell

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