Allow manually providing pubkeys for multisig addresses [$100]

[adamkrellenstein]

• Throuh CLI and through API.
• The code for finding those keys automatically in the blockchain is not wonderful, nor is the requirement for addrindex=1.
• It is inconsistent to allow the passing of pubkeys for non-multisig, though.

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[jprupp]

This is necessary to avoid having to create outgoing transactions from the individual keys used in an MS account. This is a very important feature. 👍

[toysrtommy]

Hi Adam, pinging to see if any ETA here. We're highly dependent on this feature ourself, and I think anyone using multisig feature will likely need that as well.

[adamkrellenstein]

@toysrtommy, as I said elsewhere, this is a relatively low priority. If you need a feature developed, you need to give us advance notice.

[adamkrellenstein]

Untested solution: 7089292
PR: #490