Promise and RxJS wrappers around the Darwinia JS RPC

Interfaces for interacting with contracts

Peripheral smart contracts for interacting with message protocal.

- CompactMerkleProof.sol: Compact verification for MMPT(16-radix) generated by Substrate [trie](https://github.com/paritytech/trie) lib. - SimpleMerkleProof.sol: Non-compact verification for MMPT(16-radix) generated by Substrate [trie](https://github.com/

A sample using @polkadot/typegen to generate type definitions

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Oracle and Relayer based Message Protocol

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