A temporary (placeholder) implementation of the Wallet Contract.

See near/NEPs#518.

Must not use in production!

Currently, the contract build is disabled!

The build.rs generates WASM file and saves it to the ./res directory.

If you want to use the contract from nearcore, add this crate as a dependency to the Cargo.toml and use near_wallet_contract::wallet_contract().

In order to review changes to the WASM file, rebuild the wallet contract locally (remove it beforehand to make sure it was rebuilt later) and check the hashes by running check_wallet_contract and check_wallet_contract_magic_bytes tests in src/lib.rs.