* Ensure correct transaction category when sending to contracts but there is no txParams data
* Update gas when pasting address in send
* Gracefully fall back is send.util/estimateGas when blockGasLimit from background is falsy
* Remove network request frontend fallback for blockGasLimit
* Add some needed slow downs to e2e tests
* 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
* transactions - use safe-event-emitter over events
* tests - pass a platform object on init with a noop showTransactionNotification
* test - fix for tx-state-history-helper trying to reduce an empty array
* deps - safe-event-emitter
* lint
* Add beginning of test
* Resubmit approved transactions on new block
May fix#4343 and related issues, where an error could leave
transactions stranded in the approved state.
* Remove unused test
* Re-approve transactions when retrying approved
* Add retry approved test
* Include approved in pending tx count
* Fix getPendingTxs()
* Linted
* Only throw hash error in submitted state
* Only check submitted txs for block inclusion
* Fix test expectations
