* Use Incrementable from frame_support::traits * Chore * make incremental fallible and new nfts function for custom collection ids * fmt * fix benchmark tests nfts * add test * fmt * add safety comment to CollectionId * fmt * add comments to Incrementable * line wrapping * rewrap comments * address feedback * fmt * change unwrap for expect --------- Co-authored-by: Jegor Sidorenko <jegor@parity.io> Co-authored-by: parity-processbot <>