Local caching of address data

[coderofstuff]

• On first device load, only the first address from the Ledger device should be shown. This will be the address from the path 44'/111111'/0'/0/0
• A button Generate New Address should be shown
  • On click, prompt the ledger device for the new address (the next index in the RECEIVE addresses)
  • The user will confirm the address on the device. On approve, the address is added to the list.
• On subsequent loads, all previously loaded addresses should be shown - locally cache this address list in local storage (with their path info)