near-sdk (Rust) 5.18.0

Added

• relax owned String requirements (#1404)
• Add Event::to_event_log() utility function (#1394)
• be explicit about detached Promises (#1400)
• (near-sdk-macros) #[near(contract_state(key = b"CUSTOM"))] (#1399)
• optimize Promise::and (#1396)
• use #[serde_as] for #[near(serializers = [json])] (#1393)
• Introduce new method ::ext_on(promise) for all Ext Contract Traits for using high-level APIs for batching actions into a single promise receipt (#1413)

Fixed

• Pass mutable buffers to sys out-params in balance and stake getters (#1412)
• Fixed the TreeMap::range() method to respect lower Bound::Unbounded (#1408)
• (serde) avoid String allocation in error mapping for integers and hash (#1411)
• Fix serde_as and ordering of the fields in AsNep297Event (#1405)
• Added support for #[private] attribute for #[init] methods (#1410)
• allow PanicOnDefault on eums (#1401)

Other

• Use CryptoHash wherever applicable and other small papercut fixes (#1387)
• fix example header format for readme.md (#1407)