ERC-4626 Tokenized Vaults

FinalERCcreated 2021-12-228 later proposals build on itrequires ERC-20, ERC-2612

Tokenized Vaults with a single underlying EIP-20 token.

Authors: Joey Santoro (@joeysantoro), t11s (@transmissions11), Jet Jadeja (@JetJadeja), Alberto Cuesta Cañada (@alcueca), Señor Doggo (@fubuloubu)

Functions this standard introduces (16)

`0x38d52e0f`	`asset()`	view
`0x07a2d13a`	`convertToAssets(uint256)`	view
`0xc6e6f592`	`convertToShares(uint256)`	view
`0x6e553f65`	`deposit(uint256,address)`
`0x402d267d`	`maxDeposit(address)`	view
`0xc63d75b6`	`maxMint(address)`	view
`0xd905777e`	`maxRedeem(address)`	view
`0xce96cb77`	`maxWithdraw(address)`	view
`0x94bf804d`	`mint(uint256,address)`
`0xef8b30f7`	`previewDeposit(uint256)`	view
`0xb3d7f6b9`	`previewMint(uint256)`	view
`0x4cdad506`	`previewRedeem(uint256)`	view
`0x0a28a477`	`previewWithdraw(uint256)`	view
`0xba087652`	`redeem(uint256,address,address)`
`0x01e1d114`	`totalAssets()`	view
`0xb460af94`	`withdraw(uint256,address,address)`

Topic0 is the keccak256 hash of the signature, which is what a log filter matches on.

`0xdcbc1c05240f31ff3ad067ef1ee35ce4997762752e3a095284754544f4c709d7`	`Deposit(address,address,uint256,uint256)`
`0xfbde797d201c681b91056529119e0b02407c7bb96a4a2c75c01fc9667232c8db`	`Withdraw(address,address,address,uint256,uint256)`

Proposals this one names in its requires field.

Later proposals that name this one in their requires field.