BLOCK_ITEM_STACK  
  The item stack to be placed as a block.
Required in intentions: none
Optional in intentions:
Autofilled by:
- BLOCK_TYPE_NOVA if the block has an item type 
- BLOCK_TYPE_VANILLA if the block has an item type 
Autofills:
- TILE_ENTITY_DATA_NOVA if data is present 
- BLOCK_TYPE_NOVA if data is present