Remove references to the bitcore-lib from the IBitcoinWallet

[mudiali]

Two suggested changes as part of this bug:

1. Remove the getPublicKeyAsHex function.
2. Update the function signatures to remove references to the bicore-lib's Transaction, Address, and Script' objects. These can be replaced by strings as the bitcoin network uses them. For example, transactionAsHex, address(string),scriptAsHex`.