Upgrade Python tools for v3

[feuGeneA]

• contract_wrappers.py

  • re-generate, update type aliases (eg Order class mapping to 0xdeadbeef... class tuple representation) ensure functionality of json schema validation
  • adapt code examples and tests

• sra_client.py

  • adapt code examples (there end-to-end tests of post, retrieve, fill, cancel)

• order_utils.py

  • either replace utils (order hashing, asset data codec, etc) with pure EVM calls to the DevUtils contract, or adapt the existing implementations

[stale]

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