Built-in data parsing / data normalization

[slavafomin]

Hello!

Thank you for this great library!

However, right now, the API is way too low-level and the data types are not normalized. Examples:

• the getAccountState() returns hash as bigint, while getAccountTransactions() requires hash as Buffer (normalization problem)
• the getAccountTransactions() returns transactions data as a big unreadable chunk of bytes that needs to be parsed somehow by the library user

This makes this library way too low-level and probably unusable for the most developers.

[jyang10086]

Do you find a way to normalize transaction hash? I am stuck too.