[WIP]This pr will add joint account feature

[susmit]

• Create JA using QR code. Keep a copy of address book line item - p2sh, JA branch pubKey (A &B), branch coordinate - depth and breadth (A & B), child chain code (A & B), JA tags x 3(modified)
• Send using URi (modified to qr)
• Receive with URI or QR but resend the latest script for new fund distribution (modified to qr)
• Recover when A loses wallet with QR code from settings of B.
• Recover for B when A is not available using in-app script updated every time there is new fund (assume 50% split)

Transaction process:-

• Alice build an transaction to spend a UTXO from the multisign address;
• Alice sign it with her key
• Alice serialize it, send to Bob
• Bob deserialize it
• Bob check the transaction, if OK, sign it with his key
• Bob broadcast the final transaction

[susmit]

known bug: merger confirmation to acknowledgment screen merger name fetched is not latest

[susmit]

bitcoinjs/bitcoinjs-lib#1211
_{View in Slack}

[susmit]

known bug:- if create button is initiated after storing complete complete joint acc object,it replaces with new imcomplete.
Solution:Lock button after on basis if joint acc exist or not.