* introduce --debug option to abi-gen and remove debug functions from @0x/abi-gen-wrappers
* make evmExecAsync protected; ignore deployedBytecode in doc comment
* trim deployedBytecode so it's undefined unless a contract has pure functions
* remove validateAndSendTransactionAsync
* Create `AwaitTransactionSuccessOpts` and `SendTransactionOpts` types
* Remove duplicate types `IndexedFilterValues`, `DecodedLogEvent`, `EventCallback` from `@0x/base-contract`
* Define SubscriptionManager and instantiate in generated wrappers
* expose subscribe/unsubscribe in generated wrappers
* update changelogs
* use SubscriptionManager in `@0x/contract-wrappers`
* 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
