ERC-6120 Universal Token Router

ReviewERCcreated 2022-12-12requires ERC-20, ERC-165, ERC-721, EIP-1014, ERC-1155

A singleton router contract allows tokens to be spent in the transfer-and-call pattern instead of approve-then-call.

Authors: Derion (@derion-io), Zergity (@Zergity), Ngo Quang Anh (@anhnq82), BerlinP (@BerlinP), Khanh Pham (@blackskin18), Hal Blackburn (@h4l)

Functions this standard introduces (2)

`0xc175dd37`	`discard(bytes,uint256)`
`0x715ef7f9`	`pay(bytes,uint256)`

Proposals this one names in its requires field.