Go's Hash is explicitly specified to never return an error on Write(), and our
own decoding functions only check for length which is gonna be right in every
case so it makes no sense returning errors from these functions.
* small fixes
* gofmt
* fix in raw tx build
* fixes after review
* balance getter interface
* moved address and signature calculation to public key
* errors handling
* PublicKey() returns PublicKey instead of bytes slice
* fixes after review
* fixes after review
* public key creation from asn1 serialized key
* small fixes
* gofmt
* fix in raw tx build
* fixes after review
* balance getter interface
* moved address and signature calculation to public key
* errors handling
* PublicKey() returns PublicKey instead of bytes slice
* fixes after review
* fixes after review
* added account_state + changed ECPoint to PublicKey
* account state persist
* in depth test for existing accounts.
* implemented GetTransaction.
* added enrollment TX
* added persist of accounts and unspent coins
* bumped version -> 0.32.0
* Created test_data folder with block json files for testing + create separate file for block base.
* Fixed bug in WriteVarUint + Trim logic + unit tests
* Refactored store and add more tests for it.
* restore headerList from chain file
* Fix tx decode bug + lots of housekeeping.
* Implemented Node restore state from chain file.
* Created standalone package for storage. Added couple more methods to Batch and Store interfaces.
* Block persisting + tests
* bumped version -> 0.31.0
* Initial draft of the neo-go wallet
* Cleanup + more test for util package
* integrated wallet into neo-cli partially
* base wallet implementation + smartcontract code.
