GUI for P2SH

[lsji07]

Testing P2SH I found that using the console is required. Propose adding GUI for P2SH multisig address creation (say 1 to 15 addresses only) and spending process to obtain partial hash to send to cosigners. Note this GUI maybe extended in future for atomic swaps between 2 users.

This may also help if we consider adding hardware wallet support later...

Something simple like https://coinb.in/#newMultiSig for creating a p2sh address in wallet or electrums

Imo the intent is to help people using the wallet and personally use a multisig in the QT wallet. Create the address and spend when required later.

[lsji07]

Issue has funding address in https://rvn.cryptoscope.io/address/?address=RBtXs3bnoFH5xxrD3JrHnTy8hbyKbcusNH bounty held by by Raven_Angels community. Contact Raven_Angels here https://discord.gg/SR3q2C8C. Donations welcome to support this specific issue by sending to the address above. RBtXs3bnoFH5xxrD3JrHnTy8hbyKbcusNH

Any code pull request (PR) added for a bounty must include test units and include changes requested by the commenting and reviewing devs and community at large that improve the security and useability of the code within the scope of the issue. The dev creating the PR with all the above receives the bounty. That dev may share the bounty with whoever they choose.