Item read (and probably write) functions need PowerNBT update.

[jb-aero]

Changes to base Minecraft code have broken how PowerNBT reads items. Until I or DPOH-VAR fix that, these functions will throw a large error in console when used, and will not perform the desired operation.

This affects:
nbt_read_inventory_item
nbt_read_equipment_item

and probably also affects:
nbt_write_inventory_item
nbt_write_equipment_item

For reference, I did not have an issue with nbt_read_block, so some things still work. YMMV. As always this is not a finished product and I appreciate any feedback on it.

flinbein/PowerNBT#28