* Set a default value for code in _determineTransactionCategory
* Adds e2e tests that fail when token txs without gas param are not properly handled.
* Adds unit tests for _determineTransactionCategory
* Base error throwing and simple gas setting in estimateTxGas on transactionCategory
* eslint: Check for unused function arguments
* eslint: Ignore unused '_' in argument list
Also allow any number of '_' e.g., '__' or '___' which is to be used sparingly
* Remove and rename unused arguments
Dan J Miller
Whymarrh Whitby
bitpshr
brunobar79
kumavis