Add `batchTransferFrom` and `ERC721ABatchTransferable` extension

[jjranalli]

This PR introduces _batchTransferFrom and safe variants, as well as the ERC721ABatchTransferable extension.

The logic was initially introduced in #444, then redesigned based on _batchBurn introduced in #450.

Assumptions

Some assumptions had to be made:

• Batch operations accept a uint256[] tokenIds param, instead of startTokenId + quantity. This was done to:
  • Allow the function to be used the same way as other common batch burns
  • Allow to operate on non-consecutive tokenIds, thus being less limiting and more practical for the caller
• The tokenIds argument assumes ordered ids
  • It is delegated to the caller making sure that tokenIds are in ascending order.

[jjranalli]

@Vectorized we should be good here