Add support for exotic cells in get requests

[dariotarantini]

In current code, there is no support for exotic cells in get requests response stack.

I expect to see output of a get request called from explorer.toncoin.org or explorer.toncenter.com, but none of them works.

404

Call get_wallet_data to this address: https://ton.cx/address/EQD0A74EtcR_lVUI8eyQcC4j2k5v4Xb7hEJMarHLehljO4HS.

ton.cx somehow works (load code and run get method), but doesnt returns exotic cells in stack. Publib is published at Ef_e9jAjAynilh3RBf6wFfgWn9pRieOg56Q7xcq8mCGwwTqe.