Add runData for executing functions with free inputs

[loredanacirstea]

We currently do not support free user inputs - only inputs that are data entries in a type's storage contract.

For free user inputs, we can change dType to have:

function runData(bytes32 funcHash, bytes32[] memory dataHash, bytes memory freeinputs)
        public
        returns(bytes32[] dataHashOutputs)

runData will append the freeinputs to the calldata, after the storage data entries.
This means that any pure function defined by funcHash must define it's free inputs last, in the function signature.