Imported from CityOfZion/neo-storm (d022d46cd851de78ee041851a80dc34e3b3b68d1).
* added draft of block and transaction interop api. * added header interop API * added attribute, transaction, input, output interop API * Added asset, attribute and account interop api. * added Runtime interop apis * added asset renew and create + contract and asset interop apis Imported from CityOfZion/neo-storm (b6810d58b98312a959980f344db24689839574c4).