Merge pull request #1 from Quantumplation/patch-1

Handle assets with empty string asset names

TxIn now implements Stringer

improved parsing of SubmitTx errors

fixed issue with close

chainSync will now auto-reconnect if ogmios drops

added string implementation

fleshing out SubmitTx implementation

implemented tx submission plus a number of state query calls

added PointStruct utility method to RollForwardBlock

added implementation for RollBackward