Data Driven Locator Bar Hiding

This mod makes a minor change to the Player Locator Bar so that entities can be hidden by items in the #wich:locator_bar_hidden tag [default values: carved pumpkin and all player/mob head items] instead of a hard-coded set of items.

The Show Carved Pumpkins data pack removes carved pumpkins from this tag which can put players back on the locator bar on servers that use the carved pumpkin for custom hats.