* Export artifacts and addresses from abi-gen-wrappers
* only export addresses, not artifacts
* abi-gen-wrappers no longer accept ContractAbi as constructor param
ABI is now hardcoded when wrapper is generated
* remove unused imports
* remove unused import
* changes after review
* fix method ordering
* update constructor args
* prettier
* statically enumerate ABI properties
* remove abi-gen-wrappers generated-wrappers from prettierignore
* add template for recursive components
* add `indexed` field for EventParameter
* prettier
* update known-good wrappers with ABIs and fix Python ABI loading
* remove generated-artifacts and update gitignore
In `@0x/base-contract`: Make `PromiseWithTransactionHash` class compatible with ES5 transpiler.
In `@0x/abi-gen-wrappers`: Regenerate contract wrappers.