Metaverse NFT Factory v3

v3 version for Factory should be the state-of-the-art optimized smart-contract, also featuring long-requested updates as:

• ERC721A cheap mints

• Optional unlimited total supply

• Mint by token ID

• Lazy mint: signed and IPFS-stored but unminted NFTs

• OpenZeppelin / Biconomy Relayer (gasless mint https://portal.thirdweb.com/guides/create-gasless-nft-drop)

• Refunds/Vesting