Issue: Separate signals for transaction confirm and cancel

[ZenRepublic]

Description

Having separate signals for transaction confirmation and cancelling messes up the flow of sending a transaction.

Suggested Improvements

Merge these signals:
fully_signed()
signing_failed(signer_id)
signer_status_changed()

into one signal:
signing_finished(signer_id, result)

Another improvement could be to change the signal "send_ready" into a function:
is_send_ready()

it would check if all needed signers have signed and then user can act accordingly with their code after signing_finished()

Extra Information

No response