Auction Modules and Base Implementation

[Vectorized]

Closed #4, and replace with this PR instead.

Terminology:

• Minter (A contract that calls the mint function on the NFT contract)
• Edition (The NFT contract called by the minter)

Minter contracts are current non-upgradeable (will change later if needed).

Actually, we don't need to make these Minting contracts upgradeable.

Flow:

• Artist call createEdition on a Minter contract.
• Buyers will call the mint function on the Minter contract, which will then call the mint function on the edition, passing along the msg.value.

Details:

• Each type of auction is in a different Solidity file. This is for modularity and code reuse.
  So, instead of having the public auction and the permissioned auction combined, we split them into two different files.
  If we want, we can add a combined public and permissioned auction like ArtistV6.
• For now, we only have the createEdition and deleteEdition functions on the Minter contract. Do we need functions to edit each of the fields individually? This will add quite a bit of work.

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[linear]

PRO-220 Auction module interface and base implementation

First goal: should be compatible with our existing formats (see buy edition)

• signature gated minting, range editions / open editions
• should be able to support out of the box formats with ability to plug in custom ones + rules
  • airdrop to a passed in list
  • reserve x amount of tokens for manual transfers by the artist
  • set price discounts for a given list of users for a given song
  • set minting rules e.g. address can only buy a maximum of 3 of this song
  • auction: fixed mint, dutch auction, free mint for x period, bonding curves
• Nice to haves: compatibility or easy porting of existing Manifold extensions
• Freeze function

Compare delegate call vs pure extension options and write out a doc. We will discuss + get some input on the path forwards. Tradeoffs in terms of security, flexibility, provenenance/tx history, etc.