Revert Some Advanced Settings stuff

Revert "Revert "Kill Advanced settings (temp)""

This reverts commit 48a174286c35f08dc3600a205ed82989032dd5be.

Revert "Button & keyboard backlight brightness adjustment (1/2)"

This reverts commit c4af466d746bc32a52136defe6ff08d6fedf17bf.

Revert "Fix removal of backlight settings"

This reverts commit 40e253430684df3d7ef3805f968fe81713bd6728.