computeLedgerHash: support new getLedger response by using
rawTransaction
BREAKING CHANGES:
* Remove the `rawTransactions` field and replace it with a new `rawTransaction` field in each transaction.
* Rename the `metaData` field (in each raw transaction) to `meta` (for consistency with rippled's `tx` method).
* Add `ledger_index` to each raw transaction.
The 'amount' field should almost never be used.
With partial payments, the field can show an amount that is
significantly less than the amount that the transaction actually
delivered. This change sets amount to 0 XRP when it may be misleading.
This change omits the `amount` when parsing payment transactions.
See `HISTORY.md` for recommended alternatives.
* major types cleanup, more formatted api methods onto new request method
- getPaymentChannel() now uses this.request()
- getSettings() now uses this.request()
- getLedger() now uses this.request()
- transaction types cleaned up a bit, but still some work left to do
* Add request interface & typings
- src/api: add basic implementation of request/requestAll()
- src/ledgers/account_info: refactor to simplify with request()
- src/ledgers/balances: refactor to simplify with request()
- src/ledgers/orderbook: refactor to simplify with requestAll()
- src/ledgers/orders: refactor to simplify with requestAll()
- src/ledgers/trustlines: refactor to simplify with requestAll()
* standardize on Formatted prefix
It is impossible to reliably compute the delivered amount from the metadata due
to fixed precision. If the partial payment flag is not set and the transaction
succeeded, the delivered amount should always be considered to be the amount
specified in the transaction.
