Allow signing via Qr (#4881)

* QR code scanning in-place

* QrScan component

* Update tests

* s/store/createStore/ in props

* Create of actual accountsInfo entry

* Exteral/hardware forget, no password change

* Add external accounts to accounts list

* Render external accounts in section (along with hw)

* Manul test bugfixes

* Display Qr code for tx signing

* Align QR code

* Hints for QR operations

* Generate actual qr codes based on tx data

* Add leading 0x if not found

* Update tests for 0x leading addition

* from & rpl without leading 0x

* Auto-detect QR code size (input length)

* Confirm raw

* WIP (lots of logging)

* WIP

* Chain-replay protection

* Readability

* Re-add r: chainId

* s = 0, r = 0, v = chainId

* Update eth_signTransaction to send transaction object

* And it actually works.

* Externalise createUnsigned/createSigned

* Check for nonce updates (future: subscriptions)

* Allow gas overrides

* Expose formatted c...