Make compiler support useful for endusers

[randomshinichi]

One should be able to ContractCreate/ContractCall easily via the CLI.

Provisions should be available for polling the result of a ContractCallTx.

• [x] ContractCreate from CLI
• [x] Encode/DecodeCalldata from cb_ and source
• [ ] ContractCall from CLI
• [ ] GenerateACI from CLI
• [ ] routine to poll the result of a ContractCall