Classic Skins

Reverts skin changes introduced in 1.20

Has multiple versions:
>Default - restores Steve and Alex from 1.19
replaces new skins with Steve and Alex
>Bearded - restores "bearded" Steve from Classic and Alex from 1.19
replaces new skins with Steve and Alex
>Legacy - restores Steve and Alex from 1.19
replaces new skins with Steve and Alex variants from Legacy Skin Pack