Enhance multi-sig ux

[reedrosenbluth]

It's currently fairly difficult to sign a multi-sig transaction unless using a single instance of TransactionSigner. This means that the transaction can't easily be signed by multiple parties. This is the case for two reasons:

1. StacksTransaction::consensus_deserialize() will fail if the transaction is not fully signed. This is problematic if you want to partially sign a transaction, serialize it, and send it to someone else to sign.
2. The constructor for StacksTransactionSigner sets its sighash field assuming the transaction hasn't already been signed by anyone.

Proposal:

• add a new deserialize_incomplete() method to StacksTransaction for deserializing partially constructed/signed transactions.
• upgrade constructor for StacksTransactionSigner such that it reconstructs the sighash from the signatures that already exist.
  • I'm not sure if this is possible...

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