Add taproot tapleaf signing #783
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Description
embit library already is able to sign tapleaves, but they are discarded.
This pr simply adds those signed signatures to the psbt.
AFAIK currently supported wallets don't support tapleafs but a seedsigner can be used with a Bitcoin Core wallet.
Here i created a helper tool to be able to use it with Bitocin Core: https://github.com/ekrembal/psbtqr
I have tested this PR on the following platforms/os: