goldenticket/v2 package

Package goldenticket is a 1/1 GRC721 NFT: one golden ticket, minted to the publisher when the package is added. It checks that a gno.land collection shows in the Adena wallet, built the way gnofly's planes are:

• the collection is a gno.land/p/nt/grc721/v0 token made with NewToken, whose NewToken and Transfer events Adena finds on its indexer;
• the read functions take a grc721.TokenID and return (value, error), as Adena calls them: OwnerOf("1"), BalanceOf("g1..."), TokenURI("1") as the <img src>, TokenMetadata("1") as JSON with camelCase traitType.

v2 of goldenticket: the image is no longer a constant. The publisher is the admin and moves it with SetImage, as the planes' SetImageBase does, so it can live where both Adena (any https: image) and gno.land's pages (an allowlist: GitHub, imgur, IPFS) load it.

Transfer moves the ticket, so it can reach any Adena account.