Type safe storage API

[fulldecent]

Everybody will be encoding/decoding useful types from a byte array. This can be included in the user lib.

Supporting types from the ABI.

https://github.com/fulldecent/aion-aip040/blob/master/src/main/java/org/aion/AVMBlockchainWrapper.java

[fulldecent]

Method naming could be harmonized with the ABIStreamingEncoder or other class