Module client and smart contract module schema

[limemloh]

Purpose

Closes #245
Closes #246

Changes

• Add ModuleClient module and type for interaction with a smart contract module deployed on chain.
• Add modules for wrapped types for: Energy, BlockHash, TransactionHash, InitName, ContractName, Parameter and AccountSequenceNumber.
• Add methods getInstanceInfo and checkOnChain on the generic contract client Contract.
• Function getEmbeddedModuleSchema for getting the module schema embedded into a smart contract module source.
• Function parseRawModuleSchema for parsing the module schema bytes.

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.

[soerenbf]

Overall looks really good! Some minor things to consider: