ERC-6956 Asset-bound Non-Fungible Tokens

🆔 ERC-165 interface ids

Computed here as the XOR of the selectors each interface defines.

IERC6956 0xa9cf7635

`0x99a346af`	`anchorByToken(uint256)`	view
`0x20cac85c`	`approveAnchor(bytes,bytes)`
`0x5aa7ba8f`	`approveAnchor(bytes)`
`0x287a0c54`	`approveAuthorization()`	view
`0x22e26bf5`	`attestationsUsedByAnchor(bytes32)`	view
`0x15f75281`	`burnAnchor(bytes,bytes)`
`0x0cd53d5f`	`burnAnchor(bytes)`
`0x901637e2`	`burnAuthorization()`	view
`0x43f6805f`	`decodeAttestationIfValid(bytes,bytes)`	view
`0x16c99b79`	`tokenByAnchor(bytes32)`	view
`0xb97f592e`	`transferAnchor(bytes,bytes)`
`0x25ed3fdc`	`transferAnchor(bytes)`