Undo actions on player radius

[hirata-estate]

Option to undo actions if a player is within a distance of the entity, would be very nice to make entities feel more 'alive', while still optimizing mobs that are not in the immediate vicinity of the player.

      undo-on:
        default:
          # Should we undo this action when the mob is interacted with?
          interact: true
          # Should we undo this action when a player is within a specified distance?
          # radius: <radius-xz> <radius-y>