elrond-wasm 0.18.0, mandos 0.8.0

• New math hooks exposed from Arwen:
  • pow, log2, sqrt
  • cryptography: elliptic curves
• deploy_contract now returns Option<Address>
• deploy_from_source_contract API
• Send API refactored for more consistency and ease of use.
• High level proxies can be used to deploy contracts.
• Mandos log syntax updated, to match Arwen.
• A better #[only_owner] annotation, which can be applied directly to endoint methods. This annotation also shows up in the ABI.
• elrond-wasm-derive now an optional dependency of elrond-wasm. Use #[elrond_wasm::contract] instead of #[elrond_wasm_derive::contract] now. Same for proxies and modules.
• A zip with all the wasm outputs is now added to each release on Github.