Use RIF Wallet v2 core - Complete

[jessgusclark]

• Uses new core from @rsksmart/rif-wallet branch v2.
  • The only changes to core so far was to fix lint issues and add getChainId method.
  • Does not pull over the tests.
• Implements new KMS which is saved into storage. The Key has changed, so loading the app will now create a new account and save it with its new format.
• Updates send and receive screens to use { account: RIFWallet } instead of { account: Account}
• Updates a few tests, including smartWalletAddress which is no longer a promise.
• Uses the ERC20 class to send RIF in tempscreens/smartwallet.ts screen

Pending:

• Sending RIF does not work because of an error interacting with the contracts.
• Receive screen is broken because there is an issue with getting the chainId. Will be fixed with this PR Replace library #6
• Picker test is failing

future:

• has only a single RIFWallet, this could be changed to loop through the saved accounts, or add accounts.
• restoring and creating the KMS is handled in context. When the create wallet screens are complete, this logic can move to them and the context can expose a getter/setter for the KMS.

[ilanolkies]

Ref: #5

[ilanolkies]

Closes #20

[ilanolkies]

• Updated core. Made changes on onConfirm to get just { gasPrice, gasLimit }
• Updated ReviewTransactionModal. It now edits only gasPrice and gasLimit