Alex Bean
3aaf62add4
I have added some Traits that are missing and are useful for dealing with non-fungible tokens on other pallets and their implementations for NFTs pallet. - In the Mutate trait, added methods for dealing with the metadata: `set_metadata`, `set_collection_metadata`, `clear_metadata` and `clear_collection_metadata`. The motivation of adding this methods coming from a StackExchange question asking for it: [Setting metadata of an item of the Nfts pallet in a custom pallet](https://substrate.stackexchange.com/questions/9974/setting-metadata-of-an-item-of-the-nfts-pallet-in-a-custom-pallet) - A Trait for trading non-fungible items. The methods in that Trait are `buy_item`, `set_price` and `item_price` An example of where this Trait can be useful is a pallet that deals with [NFT Royalties](https://forum.polkadot.network/t/nfts-royalty-pallet/3766) and needs to perform this actions. --------- Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>
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