* Delete CachedBalancesController.cachedBalances
* Migrate provider to Rinkeby instead of deleting it
* Convert hex transaction metamaskNetworkId values to decimal
* Don't migrate provider state in e2e tests
* Don't kick custom RPC users to Rinkeby unnecessarily
* Use provider.chainId for address book chainId values
* Add address book migration
* Fix failing unit test
* fixup! Merge branch 'develop' into address-book-use-chainId
* Select address book entries for display by chainId
* Merge all address book entry keys
* fixup! Merge all address book entry keys
The chosen token in the `send` flow was set from one of two places:
`metamask.selectedTokenAddress` or `metamask.send.token`. The former is
used most of the time, but the latter is used for the 'Edit' button
shown in the upper-left of the confirmation UI.
The send flow will now exclusively use `metamask.send.token` for the
token state during the send flow. `metamask.selectedTokenAddress` is
now only used for the selected token state on the Home screen. This
simplifies the Redux state, as the send token is now in one place
instead of two, and `metamask.selectedTokenAddress` has only one
purpose.
