Added ERC1155 properties

[the-caliber]

It includes following ERC1155 internal and external properties:

Basic properties

• balanceOf() should revert on address zero
• balanceOfBatch Works as expected
• safeTransferFrom() should revert while transferring unapproved token
• safeTransferFrom() correctly update balances
• safeTransferFrom() should revert if from is the zero address
• safeTransferFrom() should revert if to is the zero address
• safeTransferFrom() to self should not break accounting
• safeBatchTransferFrom() to self should not break accounting
• safeBatchTransferFrom() correctly update balances
• safeTransferFrom() should revert if the receiver is a contract that does not implement onERC1155Received()
• safeBatchTransferFrom() should revert if the receiver is a contract that does not implement onERC1155Received()

Burnable properties

• burn() destroys token(s)
• burn() destroys token(s) from approved address
• burnBatch() destroys token(s)
• burnBatch() destroys token(s) from approved address
• cannot transfer a burned token
• burned token(s) should not be transferrable when burned with burnBatch

Mintable properties

• Should mint tokens and should increase balance
• Should mint tokens in batch and should increase balance

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This doesn't include properites/test for erc1155 properties but it includes contracts/ERC1155/external/test/ and contracts/ERC1155/internal/test/.

[montyly]

This is great, thanks @the-caliber. We will review it asap