Placeholder for Effective Skin UUID

[bundabrg]

I use the plugin Myskin to allow players to change their skin very easily. The developer has added an api to retrieve the effective UUID of the players skin.

Can this added as a placeholder here. That way I can display a bust of the player in their currently selected skin.

More info: https://www.spigotmc.org/resources/myskin-1-8-1-13-1.52303/ I'll see if I can send through a PR for this.

[triesharder]

I would like i too, very much!