- `TransactionReceipt.blockHash` is optional
- Block.number is optional (in case node doesn’t return this in the event)
- Refactor confirmations waiting such that there is no polling for a receipt at the start
- Make BlockHandler and SubscriptionHandler async
- change casing of constants
- change return type checking of contract method to check for `Confirmable` instead of `?TransactionRepsonse`
- Reduce miner sleep to 10ms
- Change `wait` and `Waitable` to `confirm` and `Confirmable` to avoid conflict with chrono’s `.wait`.
- Update params on `.confirm` so that the compiler can restrict values of the `int` to `Positive` and `Natural`.
- Add `Block` and `TransactionReceipt` conversion tests to test for missing block number and block hash.
- Add tests for confirmation calculations and determining if a tx has been mined from its receipt.
- Assume that blockNumber returned from node will be null or empty string, in which case we can parse as 0 and test for that condition.
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