Custom world generation/block state provider


 * : The type of the block state provider. One of,  ,  ,  , or.
 * If  is   or  :
 * : The block to use.
 * If  is  :
 * : A weighted list of block state entries.
 * A block state and its corresponding weight.
 * : The block to use.
 * : The weight of this entry.
 * : The weight of this entry.
 * : The weight of this entry.