UI support for hardware wallets (#4539)

* Add parity_hardwareAccountsInfo

* Ledger Promise interface wrapper

* Initial hardwarestore

* Move ~/views/historyStore to ~/mobx

* split scanLedger

* test createEntry

* Also scan via parity_hardwareAccountsInfo

* Explanation for scanning options

* react-intl-inify tooltips

* add hwstore

* Listen for hw walet updates

* Return arrays from scanning

* Readability

* add u2f-api polyfill

* check response.errorCode

* Support hardware types in state.personal

* Tooltips (to be split into sep. PR)

* Tooltips support intl strings

* FormattedMessage for strings to Tooltip

* Fix TabBar tooltip display

* signLedger

* Use wallets as an object map

* PendingForm -> FormattedMessage

* Pending form doesn't render password for hardware

* Groundwork for JS API signing

* Show hardware accounts in list

* Cleanup rendering conditions

* Update RequestPending rendering tests (verification)

* Tests for extended signer middleware

* sign properly & handle response, error

* Align outputs between Parity & Ledger u2f

* Ledger returns checksummed addresses

* Update ethereum-tx for EIP155 support

* Update construction of tx

* Updates after sanity checks (thanks @tomusdrw)

* Allow display for disabled IdentityIcon

* Disabled accounts

* Disabled auto-disabling

* Password button ebaled for hardware

* Don't display password hint for hardware

* Disable non-applicable options when not connected

* Fix failing test

* Confirmation via ledger (u2f)

* Confirm on device message

* Cleanups & support checks

* Mark u2f as unsupported (until https)

* rewording

* Pass account & disabled flags

* Render attach device message

* Use isConnected for checking availability

* Show hardware accounts in defaults list

* Pass signerstore

* Update u2f to correct version

* remove debug u2f lib

* Update test (prop name change)

* Add ETC path (future work)

* new Buffer -> Buffer.from (thanks @derhuerst)